What is the name of this zombie movie?

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boys parents were killed by zombies, a guy saves him and trains him how to kill zombies, they move for Alaska hoping that there are no zombies because of the low population, along the way they make friends, an old nun, a black guy, and a pregnant girl, the villain turns into a hybrid zombie and kills them (the guy had killed villain’s son coz his son was trying to rape the nun) but the guy and the boy survive, they then meet another girl, and the guy leaves him with his locket

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