'Magnum P.I.' Sneak Peek: Rick Suspects Magnum and Higgins Are 'Totally Doing It' (Exclusive)

New episodes air Sundays at 9 p.m. ET/PT on NBC. In the March 19 episode, titled 'Dead Ringer,' Katsumoto’s (Tim Kang) hearing date has arrived and he will learn if his career in law enforcement is over for good or not. Magnum (Jay Hernandez) and Higgins (Perdita Weeks) are hired to investigate a man their client believes committed murder. Rick’s (Zachary Knighton) suspicions grow on their relationship.