The Shootist and The Cowboys.
You must spread some Reputation around before giving it to Mayhem again.
My question is actually a mistake (yes, I am capable of making them on rare occasions!

:1orglaugh) and a common misconception on my behalf actually although, technically, he wasn't specifically "killed" in all of these but rather ended up dead in some fashion. Your answers are inclusive however and two of the most recognized.
The Shootist and
Sands of Iwo Jima were the ones I was referencing in my question. Full list is here....sorry for the unforced error:
The Shootist (Killed in a gunfight)
The Cowboys (Killed by Bruce Dern)
The Alamo (Killed by Santa Anna's army)
The Sea Chase (Lost at sea, unknown if he was drowned or just got away)
Sands Of Iwo Jima (Killed by enemy sniper)
The Fighting Seabees (Killed while under enemy fire)
Wake of the Red Witch (Killed by giant squid)
Reap the Wild Wind (Drowns in wreckage)
Central Airport (He was a corpse)