|All Quiet on the Western Front (1930) [Paul Baumer]: Shot to death by a French sniper as he reaches out of the trench to touch a butterfly. We only see a close-up of his character's hand (director Lewis Milestone actually used his own hand in the final close-up).
Columbo: Mind over Mayhem (1974) [Dr. Howard Nicholson]: Killed by Jose Ferrer, who stages the murder to look like a burglary.
Battlestar Galactica (1978) [President Adar]: Killed in an explosion when the Cylons fire on his ship. (Thanks to Michael and JEC)
Damien: Omen II (1978) [Bill Atherton]: Drowned in the river after Jonathan Scott-Taylor's powers cause him to fall through the ice, while the others try to rescue him. (Thanks to Robert)