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>> hello. im andrea canning. and this is dateline. ♪ ♪ ♪ >> i was just like, oh my god -- this is really an answer. it may not be definitive, but this guy knows something. ♪ ♪ ♪ >> a young couple vanishes. then, nearly a decade later, a discovery in their own backyard turns the mystery into a murder. >> they find a back, and inside the back is a human skull. >> detectives had a suspect. and then, he disappeared, too. >> his trailhead just stopped. >> until this -- >> please...

this is really an answer. it may not be definitive, but this guy knows something. ♪ ♪ ♪ >> a young couple vanishes. then, nearly a decade later, a discovery in their own backyard turns the mystery into a murder. >> they find a back, and inside the back is a human skull. >> detectives had a suspect. and then, he disappeared, too. >> his trailhead just stopped. >> until this -- >> please, please, bring him back. >> he kidnapped his own daughter right from this boston straight, afte...

>> and my mom sent a very definitive no. and then after that, you know, it got a little weird. and he started asking other inappropriate girls -- >> not age-appropriate? >> not age-appropriate. >> some dusty old stories remains buried nearly a decade, not a great start for a murder investigation. but that guesthouse was still standing, and guest detectives got work to see if they had any clues, about the man who once lived there. >> there was luminol in the guesthouse. and they found four pretty...