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Still advising him. >> they had no case without those hairs. that's why they didn't go forward initially. they didn't have a case. and they knew it. >> their advice to daker, focus on those hairs and don't obsess about lottie. >> this case had to be defended by attacking the science of the state's case. >> but daker couldn't seem to let go. his focus from the start was his relationship with the state's star witness. >> i've been in her bed. i've been in her sofa. >> it was a romance, intimate in every way. lottie insisted that wasn't true. >> some things had to be beyond frustrating saying you...

>> this case is about obsession revenge and choice. >> he argued that he was a violence talker and that his obsession with one woman led to the murder of another. >> you can't get inside the mind of a psychopath and figure out why they would kill. >> evan said daker had left a trail of destruction and those critical hairs. >> the cold case solved by advances in dna technology proved positive that waseem daker is a killer. >> defending waseem daker was waseem daker. >> i want to point out three principles of law i want to give you. >> before he took over his own case he had been represented by ...

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...

Analysis. >> the lab test kept coming back without the physical evidence that we needed, that linked him to the dead body of carmen smith. that's when we knew that it may always be a circumstantial case. >> and the circumstantial part of the case was too weak to make an arrest. prosecutors believe he was the only viable suspect. they didn't have the evidence to prove it. the investigation stalled. >> so waseem daker walked away from the murder. >> he walked away from the murder but not some accountability. the police felt like they had a viable way of charging him with aggravated stalking. >> ...

Evidence that he said explained lottie's incredible reversal, letters confiscated from daker's prison cell. 4,000 pages of correspondence between the convicted murderer and the woman who testified against him. >> i sent him daily devotions and bible verses, encouraginc cards and a lot of information, case files. i actually feel like i'm his personal secretary in a way. >> reporter: it turned out lottie had actually been helping with daker's appeal. he gave her research assignments. she looked up cases and printed documents, mailed them to prison, and then waited for his next request. do you th...