As Brian and Isk point out, it's going to be a matter of whether you reasonably thought that you were facing a lethal thread and had no other choice.
But if your defense is, "I thought I was being attacked by a Zombie.", you'll be flunking the reasonable person test.
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"It is long been a principle of ours that one is no more armed because he has possession of a firearm than he is a musician because he owns a piano. There is no point in having a gun if you are not capable of using it skillfully." -- Jeff Cooper
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