|Love Me Tender (1956) [Clint Reno]: Reportedly shot to death by Richard Egan's cohorts while trying to protect Richard. (Thanks to Robert)
Flaming Star (1960) [Pacer Burton]: Mortally wounded in an off-screen battle with the Kiowa warriors; we see him ride into town after the battle to say goodbye to his brother (Steve Forrest), then ride off into the distance to die.
Frankie and Johnny (1966) [Johnny]: Reportedly shot by Donna Douglas in a play-within-the-film sequence. (Thanks to John)