It appears at the end of the final mission that he and Cortana were killed when Halo was fired before it was ready - the blast that destroyed the Flood also destroyed their frigate at the end of Halo 3.
But, if you are one of those people who actually sit through the end credits of a video game, you'd know that there's a secret video, proving that both Master Chief and Cortana are alive.
He's master chief, he doesn't die because he is too awesome to die
No, the Master Chief didn't die. He's simply unconscious and floating in space.
Becuz master chief cant die he respawnz!
Yes he can
no neither him or the master chief die in halo 3
He doesent die.
Master Chief is a male.
Arbiter joins master chief in halo 3 to fight the flood
no he when to halo 4
no he surviveYes he falls off a bridge and dies
Probably not but master chief does die. No. The Arbiter does not die. To the previous answerer, wrong. Master Chief does not die. If you beat the entire game on legendary, you will get an extended alternate ending showing MC floating in the ruined frigate. He then pulls himself to a cryotube and freezes himself.
master chief !!