Magnum P.I.: Season 3, Episode 7

3 - 7: Killer on the Midnight Watch

When an overenthusiastic neighborhood watch group asks Magnum and Higgins to investigate a shady character living on their block, they are shocked to find that they may have inadvertently stumbled upon a serial killer on the loose. Also, Jin's new money laundering business leads him to want to help a new friend.