earlier. and i told him, if he would page me just say put in type in the words that says dna matches. reporter: and right on cue, the detective s pager went off. and i showed it to mr. matthews. it said dna matches. reporter: so what s his face like when he looks at that match? he became pretty emotional. and he said he it was an accident but he had killed her. reporter: the detective called carolyn s parents and gave them the news of the confession. said, i think we got got him. i said, well, how sure. he said, i ll bet the farm on it. reporter: it was the next morning when kristin lancaster opened up the newspaper and learned her attacker had been charged with murder. i felt overwhelming guilt, just overwhelming guilt knowing that he d killed someone and that, you know, perhaps i hadn t tried hard enough to make people believe me. reporter: did you feel like a life could ve been saved if you had ve been taken more