daker is the man. >> defending waseem daker was waseem daker. >> i want to point out three principlese he took over his own case, he had been represented by an experienced father and son team, michael and jason treadway. they were still advising him. and believe the states case was vulnerable. >> 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 two had a sexual relationship. >> there was no relationship so there's nothing, you know, more that i can say about that. >> did he ever try and do anything like kiss you -- >> no. >> since he's so in love with you. >> never

give up on waseem? are you in this until all appeals are exhausted? >> yes. i played the role of an innocent man being falsely convicted for crimes he did not do. i have to make it right. >> in 2016, the georgia supreme court upheld daker's conviction. he tried to take his appeal all the way to the u.s. supreme court, only to be denied review. >> i have no doubt that waseem daker is a cold blooded killer, and justice have been served with his conviction. it does not matter what lottie says. this case is about karmen. this case is about nick. >> that's all for this edition of dateline. i'm natalie morales, thank you for watching. >> i'm craig melvin. >> i'm natalie morales. >> and this is "dateline". >> i really want people to not be afraid and here i am an actor and i'm on "dateline" and i'm telling you my darkest secrets because i think it will help someone and it's okay to talk about it. >> an actress finds real life drama when her sister and her sister's husband disappear. >> they said lesley didn't show up for work. >> lesley's life had seemed perfect but