In 1985, Rachel’s 14-year-old sister, Lori, was found murdered, and Rachel is desperate to prove her claim that Lori’s ex-boyfriend, Walt, killed the teen and got away with it — an accusation he vehemently denies. Walt was initially tried for the murder, but the case was dismissed after the trial resulted in a hung jury — and he says Rachel needs to stop pointing the finger at him and move on. Tensions run high when Rachel confronts Walt on Dr. Phil’s stage. Where was Walt the night of Lori’s death? And, how does he explain allegations that he has made inconsistent statements to police? Then, Walt says he passed a polygraph in 1985, clearing his name. Dr. Phil calls on polygraph expert Jack Trimarco to examine the results — what are his thoughts? Plus, don’t miss Part 2 Monday, when Walt takes a new polygraph test — what will the results reveal?