It's hard to tell what a murderer looks like, because you can't look it up in the dictionary and get a picture. Maybe Mary-Sue is hormonal and goes off on a rage and kills people. Or maybe poor Edward Scissorhands slits someone's jugular vein. Personally, I don't think you can classify what a murderer looks like because even Miss America could turn and slaughter bunches of people.
And oddly enough, we talked about this in school today... ironic, no? lol.

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"To be a genius is to be misunderstood..." -Ralph Waldo Emerson