|Words and Music (1948) [Lorenz Hart]: Dies of pneumonia after leaving the hospital and walking out in the rain to see his latest show; after leaving the theatre, he collapses in the street outside a shoe store.
The Bridges at Toko-Ri (1955) [Mike Forney]: Killed (along with William Holden) in a battle with North Korean soldiers. (Thanks to Mac)
The Bold and the Brave (1956) [Dooley]: Killed in combat.
Baby Face Nelson (1957) [Lester M. 'Baby Face Nelson' Gillis]: Machine-gunned by FBI agents in a cemetery. (Thanks to Stephen)
The Last Mile (1959) [John 'Killer' Mears]: Shot to death by prison guards when he tries to "escape" (actually a deliberate "suicide-by-cop"). We only hear the shots after he goes through the gates.
The Manipulator (B.J. Lang Presents) (1971) [B.J. Lang]: Commits suicide by stabbing himself in the chest with a sword, while performing Cyrano de Bergerac's death scene in his warehouse "film studio."
Thunder County (Cell Block Girls; Convict Women; Swamp Fever; Women's Prison Escape) (1974) [Gas Station Attendant]: Presumably drowned or eaten by an alligator after the female convicts force him to jump out of the boat in the swamp; we only see Mickey jumping overboard, followed by a shot of the alligator.
Silent Night, Deadly Night 5: The Toy Maker (1992) [Joe Petto]: Killed (off-screen) by his creation (Brian Bremer); his body is shown afterwards when Jane Higginson discovers him. (Thanks to Robert)
Murder, She Wrote: Bloodlines (1993) [Matt Cleveland]: Bludgeoned to death with a flashlight by Ami Dolenz by the side of the road; his body is shown afterwards when Angela Lansbury discovers him, and the murder is shown in a flashback later on.