In 1989 during Operation Just Cause, Mason was killed (or wounded) accidentally by Woods, assuming he was narco-terrorist Raul Menendez. If Mason lives, he will return to visit Woods at age 92 in 2025.

Who killed Mason in Call of Duty?

Woods shot Mason in the leg, Chloe did not survive Salazar's betrayal and Section captured Menendez, then Mason himself will reappear at age 92 to Woods in the Vault.

Does Mason die in Black Ops 2?

If you shoot Mason in the head, you will kill him-- and if you capture Menendez at the end of the game, David Mason will retire. If you shoot Mason in the chest however, he will live, and show up in the ending with David and Woods.