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That you can't be shocked, but you can be, is all i can say about that >> reporter: but - if gavin was dead, and certainly it looked that way, where was his body how did his car wind up in the storage locker and above all, who would have wanted him dead? reina lim certainly seemed an unlikely suspect she told them she had rented the storage unit for someone else. meanwhile, detectives looked further into chandy's affair with gavin and discovered the two had met in rehab and in december 2010, less than two years before gavin disappeared. lisa found out about it. >> i was heartbroken >> reporter...

>> chandy's dad started telling a tale about something his daughter may have seen, and he was distraught and wanted to talk about it. >> and he said, "well, you know his -- you know reina? i go, "yeah, i know the name." >> reporter: reina lim she lived with chandy. she took care of chandy's grandmother. chandy's dad said reina knew something. something important. >> and he goes, "i think she knows where the car is." >> reporter: the elusive mercedes detective labbe and his partner john o'brien drove out to see reina. >> we just waited till she showed up. and we kind of surprised her >> that's ...

>> reporter: it was the boy who knew it first, knew something was wrong. his dad was supposed to take him to school that morning but after school - >> i was to go to the school and pick him up after basketball practice when i showed up he said, "daddy didn't pick me up this morning." and i said, "what? he said, "daddy didn't show up this morning." >> reporter: it can happen busy families. people forget. the boy got to school some other way. >> he said he called a friend from around the corner >> reporter: or sometimes, things fall apart. >> the situation sounded too crazy. love affairs, love t...

And so i just kept, no, it can't be it can't be. i just kept hoping i did everything i could >> reporter: but even as she ran down leads herself, it seemed to tara that lisa, her sister in law, gavin's wife, wasn't searching. >> so he disappeared and you couldn't give up on the possibility he was out there somewhere and lisa could and i wondered whether there were ever sort of dark nights to your soul where you thought i wondered if she had something to do with this >> it crossed our minds all the time it just did. i mean, did i think that she could ever be the one responsible, the physical? n...

>> reporter: so it seemed that on the night he disappeared, gavin smith met chandrika creech for sex, or comfort, or just to talk something. quite a lot to learn from those phone records. but there was more a third phone. john creech's phone. in the same spot, on the same night. and this was eerie, creech's phone seemed to be moving in sync with gavin's. >> john creech's phone and gavin smith's phone paralleled each other. >> together together >> together. sometimes hitting off the exact same towers or parallel towers >> wow what was that like >> that was an eye-opening moment >> reporter: but...