The Return of Count Yorga Vampire (1971) [Sgt. O'Connor]: Bitten by vampire witch.
Action Jackson (1988) [Peter Dellaplane]: Shot in the chest by Carl Weathers in Craig's mansion, when Craig pulls out his own gun at the end of a fight.
Turner & Hooch (1989) [Chief Howard Hyde]: Shot in the chest and stomach with his own shotgun by Tom Hanks when Tom grabs the trigger during a struggle (having first been bitten on the ankle by the dog Hooch).
Monk: Mr. Monk and the End, Part 2 (2009) [Judge Ethan Rickover]: Commits suicide by shooting himself in the head in his yard, after Jason Gray-Stanford, Ted Levine, and Tony Shalhoub discover the body he had buried there.