I didn't mean that one can't enter an insanity plea on a normal murder; I meant what you said - that actually getting away with a plea of insanity is really something. I expect the crimes would have to be pretty heinous and downright weird for the plea to hold water at all. It works all the time in Star Trek, though.
This is just me thinking out loud, but I don't think it would have to lay dormant. Maybe he just didn't infect anybody else? I don't know, there's more to it than this. But as for the people he murdered, they wouldn't have a chance of zombification since (in my theory) he ate them.
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