A popular character actor, Mundin died in Van Nuys, California in a car crash. He was killed instantly when the car in which he was riding collided with another car at a street intersection. The force of the impact threw open the door and hurled Mundin to the street. He received a fractured skull and crushed chest. The other occupants of the car were not injured. Mundin was just 40 years old.
Memorable as one of Robin's Merrie Men, for his bumbling, shy but obvious flirtation with Maid Marian's lady-in-waiting (portrayed by the wonderfully fidgety Una O'Connor in The Adventures of Robin Hood (1938).