Mission Impossible - Jim Phelps' Death

Aboard the TGV en route to Paris, Ethan(Tom Cruise) follows Phelps(Jon Voight) on the roof and the pair fight on top of the high speed train. Phelps tries to escape in the getaway helicopter piloted by Krieger(Jean Reno), but Ethan foils that plan by attaching explosive chewing gum to the windshield. The explosion instantly kills Krieger, crushing Phelps under the fiery wreckage of the helicopter.

Crank - Free Fall Neck Snap

I was originally going to post this as the death of Chev Chelios, until I learned that he survives and Crank 2: High Voltage with Corey Haim? is coming out in April of 2009. So I present to you the death of Ricky Verona, who gets his neck snapped by Jason Statham in mid-air after they both fall out of a helicopter.