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killer in a mask. >> he's clearly a brilliant individual. a brilliantly scary individual. >> his target, a doting young mom. >> she was a gorgeous strawberry blond who loved her son more than anything in the whole world. >> she was so scared. >> he struck once. would he kill again and would she be next? >> we were just so shattered and hurting so bad. >> imagine being hunted in your own home, held a virtual prisoner, your children in danger from a man with a blueprint for murder. >> i was terrified. ♪ ♪ ♪ >> she will face down evil and come forward with a new revelation that wi...

>> imagine being hunted in your own home, held a virtual prisoner, your children in danger from a man with a blueprint for murder. >> i was terrified. >> she will face down evil and come forward with a new revelation that will make your jaw drop. >> what i did is wrong. there are no words. i have everything to lose. hello and welcome to ♪ ♪ ♪ "dateline." it was a brutal crime and right away one woman said she knew what happened. the verdict was far from the end of this case. it's a story of obsession and control that will keep you guessing until the very end. here's andrea cann...

Those horror movies. he's like your worst nightmare. >> after his relieve he got a job and moved to suburban atlanta. he was a free man and enjoying life. here he is sky diving and loving it. daker's freedom galled homicide detective john doss. the karmen smith murder was now officially a cold case. to doss, daker was the one that got away. >> does a case like this haunt a police department? >> absolutely, because these cases go home with you in your mind. >> but for years, doss couldn't do anything about it. and then just by chance he was sent to a dna training seminar in 2008, a random assig...

It takes just a minute amount of tissue to come up with a full profile. >> it's called nuclear dna testing and dawes immediately thought of karmen smith. karmen was a strawberry blond and he remembered the short, dark hairs recovered from her body. not hers under layers of bedding. >> i felt it was invaluable evidence if there was enough tissue on that hair that was underneath her sweater. >> doss brought one of those dark hairs to a dna lab in texas and waited. it was almost 15 years after karmen smith's murder when the call came in. there was a match. they have identified waseem daker's hair...

Detective john doss. the carmen smith murder was now officially a cold case. to doss, daker was the one that got away. >> does a case like this haunt a police department? >> absolutely, because these cases go home with you in your mind. >> but for years doss couldn't do anything about it, and then just by chance he was sent to a dna training seminar in 2008, a random assignment that would change everything. >> back in the mid'90s very, very little at all could be done with the hair except to say the color of the hair. now when there's any tissue from the root on the hair whatsoever, it takes j...