daker's freedom galled homicide detective john dawes. he karmen smith murder was now officially a cold case. to dawes, daker was the one who 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 dawes 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 nineties, 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 just a minute amount of tissue to come up with a full profile of dna. >> it's called nuclear dna testing and dawes immediately thought of karmen smith. karmen was a strawberry blonde, 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. >> dawes brought one of