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Do you think the mafia didn't kill him? It's just about a contract killing. It reminds me more of the mafia's actions than a maniac's. And if he was killed by the mafia, then Zack is either a good guy or a maniac. Neither, if he's not a cop, would do something like that. What's the point? And now he's shown us that he was a cop, so no one would start investigating his role after the real cop's death, right?
And if he's a mafia member and was killed by a maniac, then what's the point of all this? To make the town think that there's no cop left? Or am I missing something again, and Zack was trying to convey something else to us?
By the way, what does the maniac have going on? Would a maniac stage a murder as an accident?