How many movies did he die in and what were they?

The Shootist - He is killed in a gunfight in at the end of the film.
The Cowboys - He is killed by Bruce Dern's character.
The Alamo - Playing Davy Crockett, he is killed by a Mexican soldier's lance.
Sands of Iwo Jima - He is killed by a sniper's bullet at the end of the film.
Wake of the Red Witch - He dies as the ship sinks.
The Fighting Seabees - He is shot by a sniper.
Reap the Wild Wind - He is killed by a giant squid.

His character death is not shown in the following:
The Man Who Shot Liberty Valance - His character is dead at the beginning of the film and the story is told in flashback by James Stewart who is attending his funeral.
The Sea Chase - Lana Turner and Wayne are on a ship when it sinks, but the possibility that the characters survived is left open.
The Deceiver - Ian Keith's character died, but the corpse was played by John Wayne.
Central Airport - John Wayne has a very minor role as the co-pilot of an aircraft that crashes into the ocean.

John Wayne - Wikipedia, the free encyclopedia