If you haven't watched the trailers than you should right now to understand completely. My theory of this game is that chief doesn't die at all, in fact he is not a traitor to the humans. He is the hero of the halo universe not a traitor. This is my theory as to what will really happen. The game is focused on Locke and how he is sent to find chief. But Locke is manipulated by either forerunner or covenant to kill the chief. And while this happens chief is figuring out who he really is and what his place is with the halo rings. They want us to think chief is going to die. They R trying to get us to think chief is the enemy. When he really isn't. And the enemies R manipulating the unsc to think that chief has betrayed them. When really chief is trying to save them again. The real enemy is using Locke to do what they never could.. Eliminate the master chief
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I kind of thought ONI was feeding Locke lies so they could kill chief. Your story could work too. We'll just have to wait until either the game comes out or until we find out more. Don't hate. Please.