I assume *Spoiler Alert* is implied by the name of this thread.
Hungry Joe in Catch-22 (halved by an airplane propellor)
Jimmy Jump (Laurence Fishburne) in King of New York
Clean (Laurence Fishburne) in Apocalypse Now (his mother's audio letter still playing after the boat attack)
Carson Dyle (Walter Matthau) in Charade (stage floor)
Father Damien Karras (Jason Miller) in The Exorcist (I just like the word defenestration)