Magnum, P.I. (1980): Season 5, Episode 3

5 - 3: Mac's Back

Diane's suicide triggers memories of others that Magnum has loved who have been killed, sending him into a spiral of depression. Magnum's sanity comes into question when he thinks he has seen his old friend Lt. MacReynolds walking down the street. But "Mac" is dead, so who did he see?