David takes a closer look at the New Year's Eve proposal video with a forensic psychologist and the TV host who was there that night. We also hear from people who say they witnessed violence between Michael and Sheryl first hand.
David drives cross-country to meet with Gwen, Michael Lavoie's partner of many years. Retired detectives share new details about their investigation. And a local reporter reveals a previously unreported story about Lavoie.