|On the Waterfront (1954) [Charley 'The Gent' Malloy]: Shot in the chest (off-screen) by Lee J. Cobb's thugs; his body is shown afterwards, hanging on a hook in an alley when Marlon Brando and Eva Marie Saint discover him.
Oklahoma! (1955) [Jud Fry]: Accidentally stabbed in the chest when he falls onto his own knife, after Gordon MacRae jumps from a burning haystack and tackles Rod.
Back from Eternity (1956) [Vasquel]: Killed (off-screen) by the natives in the jungle, after Rod uses his last bullets to kill Beulah Bondi and Cameron Prud'homme to spare them from the natives; the movie ends with Rod awaiting his fate, but the implication is clear. (Thanks to Mac)
Death of a Salesman (1966) [Willy Loman]: Commits suicide by walking into traffic. (I haven't seen this version, but I'm familiar with the story.)
No Way to Treat a Lady (1968) [Christopher Gill]: Shot in the stomach by George Segal during a chase through the empty theatre; he dies after delivering a final delirious monologue on the stage.
The Illustrated Man (1969) [Carl]: Mauled to death (off-screen), along with Claire Bloom, by computer-generated lions in a virtual-reality room; we only see the lions about to attack. (Note: This is an anthology film in which Rod and Claire play different characters in different stories; they survive in the other stories.)
Hennessy (1975) [Niall Hennessy]: Commits suicide by setting off a bomb strapped to his body, while being chased by police. (Thanks to Tony)
Innocents with Dirty Hands (Les Innocents aux mains sales; Dirty Hands) (1975) [Louis Wormser]: Dies of a heart attack in his living room, while Romy Schneider runs out to get help from Paolo Giusti.
Wolf Lake (The Honor Guard) (1978) [Charlie]: Shot in the chest by the mortally-wounded Robin Mattson, just as Rod is about to shoot David Huffman. (According to the IMDB, the version titled The Honor Guard ends differently, with David dying and Rod surviving.)
Love and Bullets (1979) [Joe Bomposa]: Shot to death by Charles Bronson. (Thanks to Robert)
Catch the Heat (Feel the Heat) (1987) [Jason Hannibal]: Shot in the stomach by Tiana Alexandra when he pulls his gun on her.
The Kindred (1987) [Dr. Phillip Lloyd]: Killed (off-screen) by the mutant creatures after they pull him through a hole in the floor.
American Gothic (Hide and Shriek) (1988) [Pa]: Shot in the back with a shotgun by Sarah Torgov, after Rod discovers his family dead and angrily renounces God.
Guilty As Charged (1991) [Ben Kallin]: Commits suicide by electrocuting himself in his own electric chair, using a rope to pull the switch.
In the Line of Duty: Manhunt in the Dakotas (In the Line of Duty: The Twilight Murders; Midnight Murders) (1991) [Gordon Kahl]: Burned to death when his farmhouse catches fire during a shoot-out with the FBI. (Thanks to Robert)
The Specialist (1994) [Joe Leon]: Killed in an explosion after Sylvester Stallone sends him a bomb. (Thanks to Gary)
Mars Attacks! (1996) [General Decker]: Crushed to death when a Martian steps on him after using a shrinking ray to reduce him to the size of an insect.
Truth or Consequences, NM (1997) [Tony Vago]: Shot in the back of the head by Kiefer Sutherland in Rod's office. (Thanks to Tal)
The Simpsons: Simpson Tide (1998; animated) [Captain Tenille]: Accidentally launched through a torpedo tube by Homer Simpson (Dan Castellaneta); we see the indentation of his body when it hits another submarine. (Thanks to Buck)
Cypress Edge (1999) [Woodrow McCammon]: Killed in an explosion. (Thanks to Gary)
Frozen in Fear (The Flying Dutchman) (2001) [Ben]: Commits suicide by shooting himself. (Thanks to Gary)