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He never died. Finish Halo 3 on Legendary. I doubt however the possibility that they can make such as game, the Covenant is destroyed, and unless you want to fight Forerunners, Sentinels and the Flood for a whole game, there is likely to be no Halo 4 chronologically after Halo 3. With Sgt Johnson and Keyes dead, only Lord Hood, 117 and Cortana are the remaining live main characters.

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