|Quiet Cool (1986) [Valence]: Impaled through the chest with a grappling hook after Adam Coleman Howard throws it at Nick, then uses the rope to swing Nick into a wall and drive the hook further in.
The Wraith (1986) [Packard Walsh]: Killed in a car crash while racing against Charlie Sheen.
Face/Off (1997) [Dietrich Hassler]: Shot in the neck by John Travolta in Nick's home; he dies shortly afterwards while talking to Nicolas Cage. (Thanks to Gregg, Jason, and Juliet)
The Astronaut's Wife (1999) [Captain Alex Streck]: Dies of a stroke, after being possessed by an alien being.