|Francis of Assisi (1961) [Francis Bernardone of Assisi]: Dies of natural causes; he is shown on his deathbed when Stuart Whitman visits him.
The Mephisto Waltz (1971) [Bill Delancey]: His body dies after switching spirits with Alan Alda; his spirit lives on in Alan's body. (Since it was Bradford's body but Alan's spirit that died, I'm listing it for both actors.) (Thanks to Stephen)
Night Gallery: Pickman's Model (1971) [Richard Upton Pickman]: Killed by the monster in his studio, while Louise Sorel looks on in horror.
Columbo: The Greenhouse Jungle (1972) [Tony Goodland]: Killed by Ray Milland.
Moon of the Wolf (1972) [Andrew Rodanthe]: Shot to death by Barbara Rush when he attacks her in his werewolf form. (Thanks to Michael)
99 and 44/100% Dead (Call Harry Crown) (1974) [Big Eddie]: Shot in the chest by Edmond O'Brien while Bradford is holding Ann Turkel hostage in a factory; he dies shortly afterwards while talking to Edmond. His body is shown afterwards after being dropped in the harbor with his feet in cement.
Bug (1975) [Professor James Parmiter]: Falls to his death after being set on fire by the flame-shooting insects. (Thanks to Michael)
The Swarm (1978) [Major Baker]: Stung to death by the swarm of killer bees. (Thanks to Michael)
The Incredible Hulk: The Snare (1979) [Michael Sutton]: Accidentally wounded with one of his own poison-tipped arrows while hunting Lou Ferrigno. (Thanks to Michael)