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at school. >> i called all the girlfriends. >> the clues an email to her husband and a secret she was reluctant to share. >> kind of a bombshell, heather was possibly seeing another man. >> what was really behind her sudden disappearance? that would be the most mind-blowing twist of all. >> do you think that heather would still be alive? if she hadn't gone through this transformation? >> gosh. welcome to dateline, heather, took -- a motivational teacher, had shed pounds and her past. she was starting to live the life of what she dreamed. and suddenly she vanished. here is andrea cann...

dangerous experiment. >> the main purpose of having the sleepover was to try it. >> an experiment that just might tempt other teens. >> we know it's entered our high school. >> why the clues in this mystery could save a life in your family. >> you have a lot of people watching "dateline" that need to talk to their kids. >> welcome to dateline. parents always worry there are so many dangers out in the world a teenager can face. but at a slumber party in your own basement? how could something deadly have found its way there? taken a bright, talented girl. and could it happen in your to...

italian clothing, and a spectacular bluff side home in newport beach. >> they were the little dream story. beautiful girl, good-looking guy, driving nice cars, beautiful children. >> until that summer day in 1997 when the unimaginable happened. >> male. kind of. distraught said that his wife fell overboard. >> it was a boating accident, said eric, and the coast guard agreed. something they see all too often. but soon, secrets emerged that would make some people wonder what, really happened to her? >> where was pegye, and what had gone wrong on the boat? >> coming, up it would b...

>> but while police try to prove it, another attack. >> he has got me by the throat and he's shaking me and he's yeg at me, telling me not to say a word. >> you're a prisoner in his apartment? >> yes. >> a college campus gripped by fear. a growing list of suspects. a growing list of victims, too. welcome to dateline. a killer was loose on the college texas town, leaving parents terrified. with a shocking discovery of jimmy hart's body, investigators were desperately trying to piece together the clues. was that young woman connected to her killer or did police have an active predator ...

adamant he was innocent. >> i had nothing to do with this. i swear to god. >> so, what could've possibly led to this? >> you stab that women. >> why would he convince to something you didn't do? >> why would he? what's really happened during that police interrogation. >> the evidence shows you were there. i can lie about the evidence. >> i can't lie to you about this. the officers lying about lying. >> and extraordinary look inside the interview room. >> if you don't talk to me i can't keep -- >> this is one of the most intense interrogations i've ever seen. ♪ ♪ ♪ >> welcome to...