Scott Peterson was on trial for the murder of his wife Laci and their unborn son. His parents sat down with Barbara Walters on "20/20" and tell her that their son was innocent. Watch ABC News Live 24/7 on YouTube: null SUBSCRIBE to ABC News on YouTube: https://bit.ly/2vZb6yP Latest updates: https://abcnews.go.com/ Watch full episodes on Hulu: http://abcn.ws/3bzvQQn #news #scottpeterson #crime #abcnews #2020