Dog The Bounty Hunter has joined the search for Gabby Petito's fiancé, Brian Laundrie. Authorities issued an arrest warrant for Laundrie last week after the 22-year-old Petito's remains were discovered in Wyoming's Bridger-Teton National Forest on Sept.19. A coroner has since ruled her death a homicide. Laundrie has not been seen since Sept. 14, when he left his parents' Florida home after telling them he planned to visit a local nature reserve to meditate. The Laundries reported their son missing three days later.