Magnum, P.I. S02E19 - Double Jeopardy

Robin's Nest is used as the location for a film starring Olivia Ross and her husband Jack Martin. Magnum is less-than-enthusiastic about being hired as Jack's stunt double and takes the job only because of his admiration for Olivia. But, when Jack is critically injured during a key scene in which Olivia shoots Jack with a prop gun - and the gun turns out to be loaded with real bullets - Magnum investigates the mysterious circumstances.