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I don't believe that a werewolf did it.
I'd even be more inclined to believe the second clue from the Mafia.
Okay, I understand that growling is primarily associated with a werewolf.
But what really bothers me is how the Investigator presented it. A werewolf growing armor? Can you imagine that?
Hmm... By the way, there's another possible scenario: the Mafia and the Werewolf killed the same target.