License to prove it. I said im a private detective, i need you to tell me all the evidence, all of that. Wasnt well received, at all. Finally, the break they needed. We got the match. Leading to one of the greatest twists of all time. You could not have shocked me more. What really happened in the middle of the night. Thanks for joining us. Im lester holt. In some of the most difficult murder cases there just arent any suspects. In this story, there were plenty. But it would be years before technology and one determined woman would help reveal who the killer really was. And in a case that started out with so many possibilities, no one would believe how it ended. Heres josh man ca wit. It was october 1984 when sheilas phone rang. It was a girlfriend. And she said that theres been an accident. An accident involving sheilas good friend, freshman roommate and fellow student at Southern Methodist university, angela. And i initially thought and gee h and angie had been in a car accident, i w