The Mystery Of Slide Mountain

"The Mystery Of Slide Mountain?" Tonight, March 8, 10 p.m. ET/PT

Peter and Rinette Bergna were a seemingly normal and happily married couple. One night, the couple were driving in the Sierra mountains. Their pickup truck ran through a guardrail and down an 800 foot cliff. Rinette was killed; Peter, who was somehow ejected, suffered relatively minor injuries. Was it an accident, or murder? Find out.