here again is keith morrison with a killing in cottonwood. >> it was evening in cottonwood, california 2012, five months to the day after the murder of karen duenas. her widow were marked and our son casey were watching tv. there was a knock at the door. and when mark saw the detectives -- >> he was upset. he couldn't believe it. like are you kidding me? >> they were not. detectives had suspected mark all along and now they had a warrant for his arrest. mark duenas was charged with first degree murder, held on a 1 million dollar bail to await trial. >> to see him in that situation was surreal. and you hope the system works because there is an innocent man up they're having to go through this. >> the whole extended clan including karen's family told anybody who would listen that the police made a huge mistake. >> i had never called anybody a name, he is not that kind of guy. >> i can't think of one time when he raised his voice to anybody. >> the family support is what's persuaded an attorney to take the case. ron powell was his name. >> at first i'm thinking, i don't want to go up ther

then, early the next morning, he buried her body in a clump of cottonwood trees. >> after we had on withhand and said thanks. he stood up, shook my hand and said, i told you i would do it. i said, you did. he said, you just wouldn't give up. and i looked at him and i said, you are right. later that day, travis also confessed to the attempted murder of lydia tillman. soon, he would be sentenced separately for both crimes. but there was one last surprise coming, something no one saw coming, least of all travis forbes. coming up, as travis or waits sentencing, the courageous young woman who had beaten the odds makes a stunning move in the court from. >> to deal what she did and endure what she went through, she's a superhero, in my eyes -- >> when dateline continues. ires pop] dang it. that's some bad luck brian. and i think i'm late on my car insurance. good thing the general gives you a break when you need it. yeah, with flexible payment options to keep you covered. so today is your lucky... oh! [crash] ...day. meteor! [screams] dangit. for a great low rate, go with the general. detect th