|Play Dirty (1968) [Captain Douglas]: Machine-gunned, along with Nigel Davenport, by Dennis Brennan, while Michael and Nigel are disguised as German officers. (Thanks to Brian)
Battle of Britain (1969) [Squadron Leader Canfield]: Killed (off-screen) in an explosion when his plane is shot down in a dogfight. (Thanks to Bill)
Get Carter (1971) [Jack Carter]: Shot in the head with a sniper rifle by a hitman while walking along the beach.
Sleuth (1972) [Milo Tindle]: Shot in the back by Laurence Olivier as Michael is about to leave Laurence's mansion; he dies shortly afterwards, just as we hear the police arriving. (Thanks to Spiderman)
The Destructors (The Marseille Contract) (1974) [John Deray]: Shot to death by one of James Mason's hitmen. (Thanks to Fred)
The Eagle Has Landed (1976) [Colonel Kurt Steiner]: Shot to death by British soldiers after he shoots a decoy Winston Churchill look-alike.
Deathtrap (1982) [Sidney Bruhl]: Killed (off-screen) in a struggle with Christopher Reeve; as I recall, the movie suddenly cuts from a scene of Michael and Christopher fighting to a scene of two different actors 'killing' each other in a stage play based on the storyline.
Mona Lisa (1986) [Mortwell]: Shot twice in the chest by Cathy Tyson during a struggle in the apartment.
The Muppet Christmas Carol (1992) [Ebenezer Scrooge]: Dies (off-screen) under unspecified circumstances, in the vision of the future shown to him by the Ghost of Christmas Future; his death is revealed when Michael sees his own gravestone. (Thanks to Tommy)
On Deadly Ground (1994) [Michael Jennings]: Killed in an explosion. (Thanks to Fred)
Blood and Wine (1997) [Victor Spansky]: Smothered with a pillow by Jack Nicholson.
The Cider House Rules (1999) [Dr. Wilbur Larch]: Dies of an accidental overdose of ether in his office; shown in a flashback when Tobey Maguire reads a letter informing him of Michael's death.
Get Carter (2000) [Cliff Brumby]: Shot in the back by Sylvester Stallone.
Last Orders (2001) [Jack Dodds]: Dies of a heart attack while watching a horse race.
Secondhand Lions (2003) [Garth]: Killed (off-screen) in a plane crash, along with Robert Duvall, when they try to fly their biplane upside-down through a barn door; we only see the wreckage afterwards. (Thanks to Stephen)
The Statement (2003) [Pierre Brossard]: Shot twice in the chest by Ciaran Hinds in an alley. (Thanks to Stephen)
The Weather Man (2005) [Robert Spritzel]: Dies of lymphoma (off-screen); his body is not shown, but there is a scene of his son (Nicolas Cage) attending his funeral. (Thanks to Eric and Chris)
Children of Men (2006) [Jasper]: Shot three times in the head and chest by Chiwetel Ejiofor; shown from a distance while Clive Owen and Pam Ferris look on helplessly. (Thanks to ND)