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>> hello. i'm 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, please, bring him back. >> he kidnapped his own daughter right from this boston straight, after c...

must've been. it was hard to go to sleep some nights. ♪ ♪ ♪ >> reporter: a young woman living on her own. hurt in the middle of the night. >> she was vulnerable, alone, and in bed. >> a crime that jolted a sleepy seaside community. killer walking among them. >> i do not think that it really sets in, that we are all are in a little more danger at that point. >> reporter: >> young, fun, and pretty. cory had plenty of admirers. and one of them like to do much. a strange coworker -- >> oh my god. >> i was, i was obsessed. >> that is scary stuff, right there. >> exactly. >> an adori...

person. the supervisor ask to interview a girl named crystal. we didn't really have any idea who she was. >> blood all of the floor. i saw blood up the wall. >> she told -- us >> what you start cleaning up? >> i started picking things that were blood splattered. >> this woman knew about the murder, covered up. >> the things that were thrown into the fire by me or the belongings from kelsey's house. >> she could have stopped this from happening. he had a hold on her that he totally exploited. >> this whole thing is crazy. >> it took my breath away. ♪ ♪ ♪ >> was there any blood o...

she's missing. we can't find her. that's all she kept saying. everything changed from there on out. and it just got uglier and uglier. >> a loving mother one day, just disappears. >> her heart was there. she wasn't home. >> blood. >> we all know, there's something very wrong here. >> nobody, no evidence. and no suspects. no arrests. >> the ex husband and the ex-boyfriend both had alibis. >> then, lightning strikes again. >> i drove into the driveway. >> someone's been shot. >> how often are a mother and daughter killed at the same house? >> who would steal so much from the one family...

kevin klym: i'm freaking out. it's not like her to be gone this long. >> hello i'm andrea canning and the medical examiner gets back on the phone and says, this is decline. >> she was a knock, outstanding. >> she stood out, tan, beautiful. >> a playboy model wannabe who loved to party, maybe a little too much. >> i'm freaking out, it's not like her to be gone that long, the medical examiner is back on the phone and says we are sending a detective. my heart sinks. >> he pulled a photocopy of her hearing and i knew it was her. >> and police thought they knew who killed her. >> they wer...