** SHOW CHANGE**

CAN A DAD FORGIVE HIS CHILDREN WHOSE TESTIMONY SENT HIM TO PRISON FOR A HEINOUS CRIME HE SAYS HE DIDN'T COMMIT?

Elizabeth Vargas Reports on "20/20," Tonight, Friday, November 5

What could be worse than facing life in prison for something you insist you did not do, and knowing that your own children put you there? Tonight on "20/20," a father -- a decorated police officer -- accused of a heinous crime� But did he do it? And if not, why would his children lie? What did his two ex-wives have to do with his charges? Was the prosecution hiding evidence? Elizabeth Vargas reports on "20/20," TONIGHT, FRIDAY, NOVEMBER 5 (10:00-11:00 p.m., ET) on the ABC Television Network.

Three small children gave testimony that sent their father, Ray Spencer, to jail for 20 years for sexual abuse, only to come to believe years later as adults that the accusations had not been true. For 20 years Ray fought to prove his innocence, uncovering secrets and finding that the original police investigation may have been tainted from the start. Would new information ultimately exonerate him? The hour report includes never-before-seen video of his daughter 25 years ago, at age five, sitting on her mother's lap being questioned by a prosecutor -- a video never seen by the defense at the time of the case.

"If you did this to your own children, you know, you deserve to be locked away," he tells "20/20." "I didn't do it and I wasn't going to admit it. You can either roll up in a ball and let life take you, or you can just take what comes down the road and maintain integrity."

Video preview: http://abcnews.go.com/2020/video/kids-accuse-dad-pedophilia-12065105

Story preview: http://abcnews.go.com/2020/cop-ray-spencer-accused-sexual-abuse/story?id=12058741

"20/20" is anchored by Elizabeth Vargas and Chris Cuomo. David Sloan is executive producer.