|Martin Milner (1931 - )|
|Gunfight at the OK Corral (1957) [James 'Jimmy' Earp]: Shot to death by the Clanton gang. (Thanks to Betty)
13 Ghosts (1960) [Ben Rush]: Crushed to death when a ghost places him in a bed rigged to collapse, while Charles Herbert looks on in horror.
Columbo: Murder by the Book (1971) [Jim Ferris]: Reportedly killed by Jack Cassidy. (I haven't seen this movie, but I've read its premise.)