Gabby Petito's parents are all interviewed together for the first time since the 22-year-old "Van Life" vlogger's body was discovered in Grand Teton National Park in Wyoming, as the manhunt for her fiancé, Brian Laundrie, continues.

Dr. Phil welcomes back previous guest Heather and her daughter, Marissa, who is rebelling in dangerous ways, and reads a chilling text exchange in which Marissa says she has attempted to kill her mother.