hundreds of hours they spent interviewing gary ridgway, trying to get him to come clean, a process that generated more than 8,500 pages of transcripts, they were never able to get any definitive information about murders during those years. they did learn that gary ridgway's rage against women was so all-consuming that he wanted to kill his mother and all three of his wives. what stopped him? >> the answer to that and then, the sheriff himself faces down the man he hunted for 20 years. one on one, he'll stare him down. but can he get the truth out of the green river killer? when "chasing the devil" returns.