|Drum Beat (1954) [Kintpuash, a.k.a. Captain Jack]: Executed by hanging (off-screen); we last see him in his cell as he talks to Alan Ladd. (Thanks to Gordon)
Riding Shotgun (1954) [Pinto]: Shot in the chest by Randolph Scott after Charles tries to shoot Randolph (and Alvin Freeman throws off Charles' aim by shooting him with a slingshot).
Vera Cruz (1954) [Pittsburgh]: Shot to death during a battle with the Mexican forces, as he tries to help Gary Cooper and Burt Lancaster capture the cannon. (Thanks to Brian)
Alfred Hitchcock Presents: There Was an Old Woman (1956) [Frank Bramwell]: Poisoned, along with Norma Crane, when they unknowingly eat some muffins that Estelle Winwood had laced with poison to get rid of the mice. We last see them eating the muffins; their bodies are not shown.
Have Gun, Will Travel: The Outlaw (1957) [Manfred Holt]: Shot to death by Richard Boone. (Thanks to Gordon)
Never So Few (Campaign: Burma) (1959) [Sergeant John Danforth]: Killed in combat with Japanese soldiers; his body is shown afterwards when Dean Jones discovers him. (Thanks to Gordon)
U.S. Marshal: Pursuit (1959) [Pvt. 'Guardhouse' Ravenal]: Shot to death in a shoot-out with John Bromfield in the woods. (Thanks to Robert)
The Magnificent Seven (1960) [Bernardo O'Reilly]: Shot in the stomach during the final battle with the bandits, as he leads some children to safety. He dies shortly afterwards while talking to the children. (Thanks to von Toten)
X-15 (1961) [Lt. Col. Lee Brandon]: Killed in a plane crash.
4 for Texas (1963) [Matson]: Shot in the head by Frank Sinatra; he then falls into the paddle-wheel of the riverboat. (Thanks to Dick Hertz and Brian)
Bonanza: The Underdog (1964) [Harry Starr]: Falls to his death from a cliff at the end of a fight with Michael Landon. (Thanks to Gordon)
The Big Valley: Earthquake! (1965) [Tate]: Crushed to death/buried alive in a cave-in in a mine. (Thanks to Gordon)
Combat!: Heritage (1965) [Velasquez]: Killed in an explosion when he blows up a cave full of relics. (Thanks to Derek)
Guns for San Sebastian (La Bataille de San Sebastian) (1968) [Teclo]: Stabbed to death in a fight with Anthony Quinn. (Thanks to Michael)
Violent City (Citta violenta; The Family) (1970) [Jeff Heston]: Shot in the chest by a policeman on a rooftop, after Charles suicidally points his rifle at him. (Thanks to Dick Hertz)
The Mechanic (Killer of Killers) (1972) [Arthur Bishop]: Poisoned by Jan-Michael Vincent. (Thanks to R. and Eugene)
Act of Vengeance (1986) [Joseph 'Jock' Yablonski]: Shot repeatedly, along with Ellen Burstyn, by Maury Chaykin and Robert Schenkkan, after Maury and Robert break into Charles & Ellen's bedroom while they're asleep. (Thanks to Michael)