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Werewolf, maybe, but then, logically, Veg should be lying next to Cash, and the fact that Veg was killed at home shows that he didn't go anywhere)).
For now, I suspect Amko the most, because of 2 things:
1) Perhaps, the Berber clue points to the unprofessionalism mentioned in Amko's signature. First, a shot in the intestines, then - in the heart.
2) The reaction to the clue about those two shots (post #828). Why the second mention that they were shooting from an automatic weapon? It was already said in the newspaper ("This honest citizen was killed by a burst of automatic fire"). It looks like an attempt to clear himself and shift the blame to the town by creating a lack of evidence against the mafia (or making it vague).
So, in advance - Execute Amko by forcing him to watch House 2 for three weeks
Added 3 minutes later
By the way, I forgot to add - Neyra is out of my list of suspects. Until someone tells me who is in her avatar and provides me with a link to a full description of this character...