(WIND WHISTLING) WOMAN: You can't just vanish. 28-year old mother of three Tuitania Barclay disappeared from her Dunedin home in 2002. Theoretically, we're told has walked out on her three children. She's taken nothing with her that we're aware of. For both police and friends, things just didn't add up. She would not have walked off and left those kids. Not at all. Everyone talked about her, about being a good mother ` her friends, her close associates. They could see how she cared for those children. This is not a woman who's just going to walk out on those children. Something has happened to Tania. (SCREAMING) I don't believe she is alive. I hope that she turns up one day,... but it's been too long. Police believe it's never too late to solve a cold case, but your help is imperative. Someone knows what's happened to her. We have brought together a specialist team to review the disappearance of Tuitania Barclay in 2002. They will use their expertise and the most up-to-date technology to look at things with fresh eyes. We try and build a case. We try and gather the evidence that will show that one of those suspects, you know, is the person responsible for the death of Tuitania. Tuitania was a mother. She's someone's daughter. She deserves to be found. How can any boy live with that ` thinking their mother's walked out on them when we know she didn't? I want to prove to them what happened to their mother; find out for them what happened to their mother. Nearly 16 years on, the devoted mother is still missing, and her children don't have any answers. Can you help us solve the mysterious disappearance of Tuitania Barclay? Captions by Cameron Grigg Edited by Jake Ebdale. www.able.co.nz Captions were made with the support of NZ On Air. Copyright Able 2018 Tuitania, known by some as 'Tania' and others 'Tarns' but most commonly 'Tui', disappeared from her home she shared with partner Bill Brown and her three children around September 2002. Her body has never been found. The brunette, who was sometimes blonde, simply vanished. Tuitania Barclay was a mother when this inquiry started. She had three children, two young` one was a baby, at 5 and a half months, and the other one 18 months, and she had an older child by a different partner. Things had been going well, but recently, Bill had left his job, and financial pressures had begun to take a toll. The landlord comes around to the property to see them to find out why the rent hasn't been paid. This is our last known actual sighting of Tuitania. From then on, as far as we know, she has disappeared, some time in the proceeding weeks or days. Her life is basically stopped in September 2002. The youngest of six siblings, Tui was placed in foster care. Tui had a tough upbringing. Her and her sister were adopted out as children at a very early age. Tui then, as she grew up, obviously got in to trouble. Went off the rails, it would be fair to say, at a` in her early teens. Social worker Hazel Scoles knew of Tui around this time. As a teenager, she was challenging. Children become teenagers, and even children that you know the best sometimes become quite difficult to manage. During those years, Tui worked as a stripper and prostitute, and became involved in the drug scene. Tui got into a relationship with another drug user, and they funded their drug use by her prostitution, really, at that stage. It was a volatile relationship, to say the least, through those times. Tui ended up getting herself in to trouble with the police for theft and fraud matters, and spent a time in prison. She'd had a child at that stage, her first child, and that child, because of the drugs and the situations she had got herself in to, was taken off her. So Tui went to prison and realised that she had to change her way, if she wanted to get her son back. On release from prison, Tui returned to Dunedin to live. She made a firm commitment to prove she was a fit mother to DJ. Tania was highly motivated, and very, very willing to work alongside the social workers to have DJ returned to her care. I don't think that she ever put a foot wrong in terms of being motivated and working really, really hard, and that was extraordinary. She was an extraordinary woman. She was a good woman and a good mum. In December 1998, Tui had her son back, in what many have called a miraculous turnaround. She gets work and also is on the Domestic Purposes Benefit. She rents a house ` a nice bungalow in Wakari. When she moves in, she buys furniture, she gets toys, she gets bedding for her first child, and she's starting to create a life for herself. Almost a year later, Tui began a relationship with Bill Brown. Bill offered her something that previous partners never could. Well, I think it was stability. He had a job ` full-time job. I think he was caring. I think he was loving. Yeah, they went out for some time, and obviously got on really well, and they decided to move in together. During that time, in the next couple of years, they had two children. Bill continued to work, and Tuitania looked after the kids and also did work when she could do work as well. Tuitania kept a very tidy house. Everything was in place. It was a family home. There were toys. You know, at Christmastime, there were Christmas trees; there were presents under the tree. There was, you know, couches; there was furniture; there were things for the kids to play with. All the signs of a good house. It was someone` a mother who was trying to do her best on limited income. But that happiness wasn't to last. Bill stopped working, so the financial pressures went on more in the family with no money coming in. She was really, really struggling with money, and so she asked us to take DJ for a little while. It was never going to be permanently; it was just for a while, until she could sort things out, and then I get a phone call from her one day, saying that she was going home to kick Bill out. What am I supposed to do? I`I don't know what to do. She did mention he was abusive. I don't think she was happy in the relationship. Probably just going to have to leave. And we told her we'd send her some money and a parcel with some things for the babies to help her through, and she said she'd ring us back the next day,... and she never did. Later, Bill Brown would tell police that, despite still breastfeeding her youngest child, she walked out on him and the kids. He believed that she'd gone back to her old ways of drug-taking and prostitution, but basically hadn't been back to the house and there had been minimal contact with her since September. But that didn't sit well with friend Natalie, who became increasingly concerned. We kept trying to ring, and then her phone just kept going to voicemail, and then, one day, the voicemail was changed to Bill's name. Bill's stories just kept changing, and he had mentioned that certain family members had seen her, and we spoke to them, and none of them had seen her at those times that he said they had seen her. We kept telling Bill to report her missing, and he was like, 'No, she's left me. She doesn't want to see the kids', which I found very, very bizarre ` that she would not at least ring DJ, cos DJ was her pride and joy. She loved that boy. It wasn't until five months later that Bill finally reported Tui missing. He said she packed a bag ` a small bag ` and left with that, but when the house was looked at, back in 2002, most, if not all, of her clothes were still in the wardrobe. Her jewellery was there. Her leather jackets, which she loved, were there. It appeared to us very little had been taken. If she had walked out of the house, she had walked out with nothing, leaving her furniture, her phone, her car ` everything behind. So, at that stage, unfortunately, it was only treated as a missing person. But now police have a far more analytical approach to missing person cases. Today, you know, we'd be looking at all the signs, all the other things, and missing persons are treated quite differently. A lot more investigation goes in to a missing person to make sure it is a missing person. She would not have walked off and left those kids. Not at all. Tarns loved her kids. It was just very weird. Like, I've been in this job for some time now, and you don't want to leave cases unsolved, but the worst part is there are three children who've got a mother ` who had a mother ` and I'm a father with three children. I want to bring closure for them. If this is not a missing person case, what happened to Tuitania? Has she been the victim of foul play? Where is her body? Can you help us solve this cold case? * In late 2002, Dunedin mother of three 28-year old Tuitania Barclay went missing from her Wakari home. Initially, it was treated as a missing person. The staff at the time thought this was` they were being told this was a woman who's gone back to her old ways, and Tuitania was known to the police in the past as being involved with drugs, prostitution. But after almost 16 years and no word from Tui or any clue as to her whereabouts, that story seems increasingly unlikely. We have brought together a group of specialist detectives to reassess key information and search for clues to solve this cold case. Leading our investigation will be Detective Senior Sgt Malcolm Inglis ` one of the first officers to review the case. So I got all the old files and went through all those to see what was there ` what we had done, and then realised, to my eye, there was more to her disappearance than just the disappearance. Joining the team is Mike Darling ` one of the original investigators back in 2003. It just takes the right folk to come forward, to provide that information to the police. Working alongside Malcolm is Dunedin Detective Margo Kennedy. We missed out on a lot of forensic evidence, but in saying that, there's been a lot more advancements in technology, especially surrounding phones and forensic evidence. And Tracey Bransgrove, for whom this investigation has become personal. So, I live in this area, and I drive past this house most days, and I always look and I think of Tuitania. The team will relook at Tui's case with fresh eyes, ruling out every possible scenario, until they find out what really happened to the Dunedin mother of three. Margo, Tracey, Mike ` thanks for coming along for this case conference for Operation Tui. Obviously, we've got to look back at what we've done with Tui, where we're going, and what we've covered in the past, just to see... make sure we've covered all the bases, make sure what we know, you know, is accurate, and where we're going from here. We had three options around what had happened to Tuitania ` one, that she'd gone off and committed suicide and never been found, that she had just disappeared out of the country somehow, or foul play had been involved, and somehow Tuitania had been killed. Last positive sighting was the 17th of September, by the landlord, when he turned up to find out about the rent not having been paid. It appeared there was some friction in the air at that stage, the landlord thought, between the two of them. It wasn't a pleasant exchange, it was fair to say, between Bill and Tui, when they were there, and the fact that they were behind on the rent, you know, putting the pressure on both of them again. So we know September 17th, she's seen by the landlord. Mm-hm. We know that she's left the house. Two pieces of evidence suggest that Tui did indeed walk out. The first was a series of reports from people who claimed to have seen her. There were those sightings. They had a few sightings back then ` reported possible sightings. Do you remember any of those, or the...? It was looked in to, and it appeared there was a doppelganger lookalike person who was very much... which caused a few false leads, if you like. There was another lady who looked very, very like Tuitania Barclay. In fact, we went and visited her and took a statement from her, and when we showed her the photo of Tui, she couldn't believe it. She thought, 'That's me.' Even more surprising ` the doppelganger was also named 'Tui'. So it was quite amazing that we had two people ` the other person thinking the photo we've shown her of Tuitania, thinking it's her as well, or very similar. The other thing was there was some of those sightings in Timaru, which led to nothing as well. They were some friends of Bill's, weren't they? I think there was some association. There was another sighting out in South Dunedin too, wasn't there? There was one at the, um... Yeah, it's, um... At a sort of cake shop? Yep. We know, historically, through lots of research, eyewitness accounts are never that accurate or 100% positive. Not gone to any of her friends? No. Where would you go if you were gonna walk out of a relationship? You've gotta have somewhere to go and stay. Mm. No one saw her. No one mentioned her coming to stay at their place. From my inquiries, re-interviewing people, and my new inquiries, it didn't really add up. I have yet to find a person... who saw Tania at that time. Even after reviewing all the supposed sightings again, the team is still convinced the landlord was the last independent person to see Tui alive. They now concentrate on the second piece of evidence which may support claims she walked out on her family. We had that note on the envelope, which was found at the time. It was about, 'Who wants to be married to a mad bitch?' She left her engagement ring with that too, didn't she? Yeah, she did. So she was obviously trying to break up the relationship and get out of it, but` Reading on that, I see it as just saying 'I'm out of this relationship', and she's come from a situation of being, you know, in state care,... Mm-hm. ...prostitution. This is explaining who she is. She sees herself as quite a common` I'm no psychologist, but it's quite a common situation, where they belittle themselves. 'So who wants to be married to a mad bitch?' She sees herself as maybe ruining the relationship, but it's the breaking up from Bill which shows us they're finally in the process of separation in September. She's giving the engagement ring back to him. Leaving items like that behind, to me, suggests she left in a hurry. Mm. The other interesting thing was I photographed all of her clothing. Her clothing was beautiful ` she had some lovely pieces of items that she wore. And why would you leave all of your designer clothes if you're going back to prostitution? Now, this was her favourite leather jacket, and back in 2002, leather jackets were really expensive, and they said she wore this all the time and really loved it, but it didn't go. She, uh,... it was still at the house. It's just weird that you'd leave those sort of things behind. You'd expect her to take her favourite leather jacket. Yeah. It's interesting, though, it was her house. It was all of her furniture. Mm. Everything in that house really belonged to her. And the toys in the bedrooms were so well set up for those kids. Mm. She worked hard to put that house together, and she was like a mini Madonna. Like, her house was, like, all nice and just done up. It was just Tarns. And, yeah, she was very proud. Very proud of her stuff. She wanted to buy a car, and she often wrote about that in her diary, and she set goals for saving and planning to buy a car. And I find that incredibly interesting that she left the relationship and she left the car behind. I find that quite unusual. When she'd gone to so much trouble to purchase a car, why would she walk out and leave it? The car was sold and crushed before Tui was ever reported missing, so it was never forensically examined. For me, it's huge that she's walked out on those children. Yeah. I do not get the impression at all that she would be a mother that would walk out, breastfeeding a 5-month-old baby. Plunket reported well on her ` that she was a mother who was attached to her children; you know, showing loving, caring. Everyone talked about her that we've spoken to since of being a caring, good mother; someone who loved her children and would do anything for them. Could Tui have been the victim of a random attack? You know, if there was a house broken in to and she was taken or` there would be evidence of that and Bill would be able to tell us, and there'd be physical evidence at the address, which just wasn't there. So it's not` I think that's an extremely low probability. Or could something from her past have caught up with her? So we've got the possibility of drug debt ` owing money; someone's come to collect. We've still got an open mind to this inquiry. We know she came from a violent past, we know of the drug dealing, we know that, you know, anything that's involved with drugs is violence. Although drug debt, home invasion and returning to prostitution looks increasingly unlikely, the team have to methodically eliminate every possibility. I talked to a lot of girls that were involved in the sex industry, but none of them could recall her going back and working in the sex industry. They hadn't actually seen her for a long time. Did they remember from the past, though? Yes, yeah. Cos you went around all the parlours, I remember` That's right, yeah. I spoke with quite a few. I went down to the library and reviewed the Otago Daily Times classifieds and searched under Tania's working name to see if she was advertising there or then abouts, and it came up with nothing. A former South Island police officer, Tom Fitzgerald, now based in Australia, also has an intimate knowledge of the case. Tui had interestingly been in touch with a couple of people very close to her time of disappearing, and really confiding in those people about her current problems, domestic problems, and the way she felt. She did ring Natalie, up north, and she explained to her that they were having issues, and that she wanted out of the relationship, and she was going to kick Bill out. What date was that? That was... um, late September, 2002. Mm. She had quite a good relationship with her eldest boy's father, didn't she? That's right, and they regularly talked on the phone, so it was Natalie and her ex-partner that encouraged Bill to report her missing, because they were concerned every time they rung her, which they did on a regular basis, they kept in contact,... Hello? Bill was answering her phone, and at that time, DJ was actually up north with his dad, so for Tuitania not to be in contact with her eldest son was very unusual. Yeah, cos she was so close to him. Very close. Mm. She would not have left Bill with the kids at all, and she would not have not made contact with us. She knew ways to get in contact with us. For her to disappear and never contact those people again is highly unusual, but the story in the missing person report was that she'd come back and visited her children weekly for at least another month to six weeks. There's nothing to corroborate those visits. No one else has` I agree. Chris talks about, in his statement, arriving round. Is Chris the good friend? Yes. He said he was around there every day, if not every second day, or sometimes twice a day, and at the weekends. Yeah. He never once mentioned seeing Tuitania again. There's nothing to corroborate that she was coming back. I think they were the burning questions throughout my time on the inquiry, and that was ` why would she walk out and leave all of her beautiful clothes, her cell phone? And why would she leave her children and not make any arrangements for them in the future? Someone knows what's happened to her. It's a secret you can keep, but difficult. Someone knows more than they're telling us, and we want to get that evidence, get those people to tell us what did happen back in 2002. * Cold Case investigators are reviewing the file on missing Dunedin mother Tui Barclay. The evidence we have is someone who's disappeared September or October 2002. Theoretically, we're told, has walked out on her three children ` children she cared for. She's taken nothing with her that we're aware of. We're told she's taken a bag of some personal belongings with her, but we know she had favourite things, like a favourite leather jacket, favourite jewellery. You know, woman leaving all of their jewellery and makeup behind. She's left those all behind in the family home. Tracey, you obviously, um,... You know, got to know Tui pretty well by going through her personal stuff that had been seized back in the original inquiry, like her diaries ` we got all those. You've been through those, read those. What can you tell us about those? Tui regularly wrote about her thoughts and feelings in her diaries, and she kept them for years. She wrote about her personal feelings, about love, about challenges as a mother. She wrote down about DJ and his milestones. She talked about the weather, about mundane things. Her housework ` she was obviously very house proud, and that was always something she had to focus on. Her diary showed her change. OK, so moving away from drugs, moving away from that scene of where she had come from. Meeting Billy and falling in love with him. She talks about how much in love she was. How cared for she felt. Tui's diaries were taken as evidence, but mysteriously, those covering the last two years of her life are unaccounted for. So, effectively, we're missing some. Absolutely. I believe there's diaries missing, cos the last one finishes three to four weeks out before she has her second child. So there must be more diaries, because she's always kept diaries. Either she stopped taking notes and recording, which seems unlikely, or, for some reason, those diaries have been got rid of ` been destroyed. But we can't find them. The cold-case team now consider Tui's mental health. During her drug-taking teenage years, she'd attempted suicide and self-harm. Had her demons returned? So we went through and got all her medical records ` the two back at the time, Mike ` and we've been through those, and I've re-examined them all, and there's nothing there to indicate pre-natal depression. No appointments from her GP for depression or anything like that. That would be a fair comment? There wasn't any indication in the early part of the inquiry, either, about mental health issues. Taking her own life? Yeah. But, once again, medical notes... We've been through those. We've been through all her friends. We would have found her body if she had taken her own life. And also maybe left a note, or` A note for her kids. Exactly. It comes back to the kids, doesn't it? All our inquiries and everyone we spoke to didn't talk about Tuitania being a depressive. They all said, everyone who was close to her, she's not a person who would commit suicide. There was no way Tania was suicidal. Not from her phone calls. She just wanted to kick Bill out. So we just... thought maybe Bill had done something to her. He was the last person to live with her. He describes her walking away with a bag, walking down to the bus stop, and her disappearing. Continuing the review, the team relook at some evidence from Tui and Bill's home. We went to her house in Wakari Road with the ESR to do forensic testing, to see what we could find that may link us to Tuitania and if anything possibly happened in the house. So during that search, in the kitchen area, there was a calendar on the wall. We took that down, and there was a part where, behind that, the wall had been caved in. So there was cracks and the wall was indented. In the wall, we found some black hairs. They were caught in those cracks within the wall where it had been pushed in, and that was` the height of that was about 155cm off the ground. (WOMAN SCREAMS) Similar to a head height, I suppose. We spoke to Bill about that, and he gave us a couple of explanations. First one, he was drunk and fell against the wall. And then later on, he said he had` actually, no, he was drunk and he had punched the wall in, but couldn't tell us how the hairs got to be in the wall. You know, mistakes were made back in those times, and unfortunately, they got destroyed ` those hairs. Well, it is frustrating, especially the hairs being destroyed. Now, when you pick the file up, some 10 to 12 years later, and you're starting to do it, you're looking for any forensics. To find out a forensic lead has been destroyed was quite disheartening. So you've got to look at other ways of sorting it out. The team now concentrate on events leading up to Tui's disappearance and the five months before she was reported missing. Talk me through the finances. I have to refresh my memory, but her income ` was that still going in to Bill's common account? Originally, it was going in to the common account, and as we've seen with the diaries and written down, that she kept quite good records of where the money was ` $240 for rent; power, this; HP, this. She sort of knew where the money was going out to. So Bill should have been getting pretty frustrated had she walked out and she was taking the household money with her, because he wouldn't have any income. Around the time she disappeared, he went in to the WINZ office at the time and changed` they were on a dual benefit; changed that in to a solo parent's benefit. He opened a bank account in his own name so the money could be paid in to there. He got the lease changed in to his name only for the property. The phone, as we said, he took up ownership. Did Bill use her phone, or did`? He did. No, he wiped her phone and he used it as his phone. Do we remember what happened to the numbers and all the contacts and stuff on that phone? As far as I'm aware, they were wiped and he used it as his phone, and we were unable to recover any of that data because we were already over five months' down track from when she last used it. Yeah, well, no, the phone has gone, obviously. Telecom, it would have been great to have text messaging, call data. All that stuff off the phone, it would have been of value to us. We had her old bank records to show that they had been got, that the bank hadn't been used. There had been one withdrawal in that time of her disappearance of $120 through an ATM, but, unfortunately, they didn't have any CCTV on that ATM, so we don't know who withdrew that, but that was the last time it was ever used. Considering all the factors, especially the damaged wall at Tui's head height, no further use of her ATM card and no contact whatsoever with her three children, police believe there is only one scenario. There's no other conclusion you can come to other than the fact that Tui is dead. My feeling is it's foul play. I see no evidence to indicate a suicide or taking off out of the country. So I think that we're on the right direction. Absolutely. Um, this is a mum who has been killed by someone. Mm. Whether what happened to her was accidental or intentional, that's a very open question. This case, like all homicides, is extremely important to me in that she has three children. She has friends who are very concerned about her. From a police perspective, we need to find an answer for those children as to what happened to their mother. To me, that doesn't matter whether it was yesterday, 15 years on or 20 years on. That doesn't get any better for those children; it gets worse. Police are determined to find that one piece of information that will solve the mystery of Tuitania Barclay's death. Can you help? Do you have any information about the Dunedin mother of three? * Back in 2002, police treated the disappearance of Tuitania Barclay as a missing person. But while reviewing this cold case, Malcolm Inglis and his team have come to the conclusion that the mother of three was killed and her body hidden. Tui's body has never been located, which, again, for the family involved, the children involved, is really significant in their coping and dealing with the fact that their mother has disappeared, and the answers of where she is is crucial to them to move on. Whether it's, you know, premeditated or it's a spur-of-the-moment thing, a fit of rage, we don't know that. Tom Fitzgerald speculates on the mind of a killer and their actions. Well, there's two possible scenarios with the killing of a person ` it's planned or unplanned. (WOMAN SCREAMS) If it's planned, the killer has time to do all that pre-planning. 'How am I gonna do it? What am I gonna do with the body?' And that entails preparation and the likes of getting something to put the body in, whether it's a tarpaulin, whether it's bags. 'Where am I gonna bury the body?' That could involve pre-planning of digging a grave. Having that all set, ready to go. If it's unplanned, which, of course, a large majority of our homicides are unplanned, they're domestic related or they're anger related or drug-fuelled rage, but they are unplanned. What that involves, then, for the killer is, 'The person's dead. Now what do I do?' That scenario then moves on to, 'Well, I have to get rid of the body.' Depending on the timeframe available to the killer, that then dictates how far they can take that. 'Can I store the body for a day? Can I store it for two days? Is someone gonna come and see me? 'Would someone look around my house?' Which is all dependent on that person's lifestyle about where they believe that they have that time and space to think. Or do they react immediately and try and dump the body? We know through history of homicides in New Zealand, there is not many where bodies are not located. The body's the greatest exhibit you can have on any homicide inquiry. All the evidence is there, isn't it? We just don't have that evidence, you know? There's normally some sort of forensics or someone leaves something with the body, and we generally always have that. You know how long we spend at a scene where the body is. It's days examining. And without that, it just puts us always one step behind. Since Tui vanished almost 16 years ago, there have been numerous searches for her remains. We had some information that a dog had been paying particular attention to a part of the Wakari Road house. The lawn, so we went back there with ESR and spent a few days digging up that bit of the garden where the dog had shown interest, but unfortunately, we located nothing. We found photos of Tuitania at Ross Creek, which is a reservoir area ` a city reservoir in Dunedin. Just on an off-chance, the dive squad were in Dunedin, so we had that lake searched, but, to this stage, we've found nothing. The house is also situated round a lot of native bush and farm land, and across the road, there's a big dog park, and there's a substation with a lot of vacant ground as well. So it's on the outskirts of the city, and it's in close locality to a number of bush areas. Yeah. Hiding a body is possible if... when you have the time and the circumstances. The ability to take that time if you're not under pressure and you have that ability, then it's absolutely possible to have that body concealed for this period of time. So if she's been buried somewhere, we would think it wouldn't be too far away, because there's plenty of areas close to that house where a body could be easily buried. 8You know, we've got the city's forest nearby, Ross Creek and the whole reserve around there, which is all bush area, quite secluded. It wouldn't be a difficult place to, you know... You're within a kilometre, aren't you, of a huge range of terrain that would be suitable. So we've got the maps here. We'll have a quick look at those,... you know, of Wakari Road. You think of` Here's a good blown-up one, which is a bit closer in. Rudd Road, which ran up in to the bush area, which is, what, 150m past their house,... Mm. Mm. ...right up into farm land. But if you go further along, we're getting into a lot of bush area. Then even slightly further along ` we're talking, what, not even a kilometre and we're getting down to here ` you know, the house is number one priority. Yes. Going around the grounds there, because we know at the front, there's that quite high hedge, cos when we were digging there, back a few years ago, looking in that spot, no one could see us in there. Mm. No one even knew we were in there doing that. Could anything have been missed in previous searches of Tui's property? Will more up-to-date equipment be the key to finding her body? Well, we're gonna look at Wakari Road again. We haven't fully searched the whole property with ground-penetrating radar. We know if someone's been killed in their house or somewhere, the body's not going to move far. People don't like carting bodies miles in the back of a car or going miles up tracks to try and get rid of it, so there's still that opportunity that a body might be buried there, so we'll go and have a look. This sophisticated ground-penetrating radar emits a signal from any object buried up to 15m deep. If there's something that's been buried in the section, chances of finding it? Oh, if it's there, we'll find it. Her body's got to be somewhere. It's not gonna be taken a long distance or a big distance from where she's been killed. In this case, Tui hasn't got a family knocking our door down and screaming about what has happened, quite rightly, as a family would,... (WOMAN SCREAMS) ...which, to me, makes it even more important that we take that role. I think we're close. We're very close. We're one or two pieces away to complete the puzzle. Have you seen anything suspicious in the Wakari area in the past 16 years that could be linked to the murder of Tuitania? * (CHUCKLES) Hello. Hello. Hey. They say language is the gateway to culture. And I have the key. Can I interest you in the big Kiwi breakfast? (PHONE TRANSLATES INTO SWEDISH) (SPEAKS SWEDISH) PHONE TRANSLATOR: Kiwis are endangered, no? (SPEAKS SWEDISH) PHONE TRANSLATOR: I could try a little one. # Oh, oh. Oh, oh. Oh. # * Police are using the most up-to-date ground penetrating radar equipment to search for the remains of Tuitania Barclay, the 28-year old mother of three who disappeared in late 2002. It's all pretty clear through here. Clear? Yep. After a thorough scan of the property, no anomalies are found. If Tui was killed at the house or close by, police believe her body won't be far away, irrespective of how well it's been hidden. Either the person has had time... had time and circumstances where they have had time to think about how they are going to get rid of this body, and do it in a way where it is going to be concealed for a long period of time. Where to from here? We continue. We hope ` we know ` out there, there are some people who know more than they're telling us. Perhaps her ex-partner knows more than he's telling us. In 2010, Bill Brown relocated to Britain with the two boys he and Tui had together. It clearly was very important for the investigation to move forward that we spoke to Bill Brown. I first spoke to him in 2016 by phone, and we had a number of phone conversations throughout the end of 2016, resulting in him and I meeting in the UK for a formal interview in February 2017. We've obviously been to the UK and spoke with Bill. Inspector Tom Fitzgerald and myself went over there. Some interesting questions out of that. It was an unusual interview. It was a man being asked about whether or not he may have killed Tuitania. In any interview with a person who is critical to an investigation, there's a number of parts to that, and that is not only what the person says, but what they don't say. It's reading between the lines about what isn't being said. When we put it to him about the inconsistencies, about some of the untruths, about the phone, him using the phone, about the car, about changing the benefit, we really got no answers for those. He couldn't... He couldn't tell us why those things had happened. At the conclusion of that interview, I think we both agreed that there were still a number of issues that we needed to talk about in relation to the inconsistencies, and that he would go away and think about those things. He wanted to discuss things with his family, and that we would talk again in the future. Tom and Malcolm also discover through UK authorities that Tui and Bill's two children are starting to ask questions about the fate of their mother. They're getting older now, obviously, and in to 17, being the oldest. There will be questions asked by those around them. There's gonna be questions asked by family members. There's gonna be questions asked by children. Often loyalties change. The memory of what's happened grows, and the loyalties change as to why people didn't or may have not come forward at the time, or may have not told us the full truth at the time of what they knew of the circumstances. It's critical for us that those people look at what's happened and think on about the loyalties and the importance of knowing what's happened to Tui to her children, knowing what's happened to their mother. Those loyalties fade into insignificance when you look at what those children are going through without the answers ` without their mother's body or without the answers about what happened. We're hoping his friends who knew Tuitania well and came around and saw him after she disappeared will tell us more about what they know and what they saw. Our best evidence, without anything forensic, are those people who were close at the time... who are intimate friends with her and Bill and her other associates. We will keep pushing until we have completely exhausted all avenues in this inquiry, and I'm confident that we will find out what has happened to Tui. Now we're doing this for the kids as much as anything. The kids need to know what's the final conclusion, and put their mother to rest in a proper way. To find Tui's killer, police need your help. I do think it's solvable. I think there is someone out there that knows something, and that could just be the final piece to our puzzle. It's not about protecting someone now. It's about getting something that we can take to those children. You know, we've got kids, 20, 17, 15. You know, we're all parents. We want to know what happened to our parents. Someone out there who's a parent, just think about those children. Think about them wanting to know what's happened to their mum. There comes time in everybody's life ` killer, or the normal person walking the street ` where, for certain reasons, they are vulnerable, and that cognitive load that they've been holding for all those years, there will be times where they definitely want to... and will be able to... tell the truth. You know, it's tragic she's never been found. It's tragic for those boys. And I believe we owe it to Tuitania to find her, to bring her back to her boys. Her kids, and DJ, they need closure. Everybody needs closure. It's been a long time. You know, I'm a father with three children. I want to bring closure for them. I'd love to let them know what's happened to their mother. I want them to know where she is, bring her home, give them some closure. We've got an oldest boy who believes that his mother just walked out on him. How can any boy live with that ` thinking their mother's walked out on them when we know she didn't? Captions by Cameron Grigg Edited by Jake Ebdale.