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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...

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...

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 carmen smith's murder when the call came in. there was a match. they have identified waseem daker's hair, his and only his on the body of carmen smith. >> you had your smoking gun. >> absolutely. >> i got a call from detective doss. i was very happy but it was really hard for me to have to go back and tell the story of the things he did. >> lottie dreaded testifying in front of open court, in front of of his. sh...