As soon as I start my game, no matter what I do, I always start with a hostile NPC outside with an american 180 and seemingly infinite ammo that follows me and is ignored by zombies. Help!
Use debug mode to kill the NPC - you might need to assign it a key in the options menu.
NPCs in general are a buggy fest of bugs and bugging.
Just tried it but after a few seconds of doing it my game crashes.