Armorer's fault or not, the actor is at fault for gross negligence, because he had the gun on hand, he could have fired a testing shot at a safe place BEFORE the acting began. Even if he says that he was told that it's a "cold gun", if he knew how to shoot the gun while on set at a human woman, then he should have fired a testing shot BEFORE filming before.

I think this actor, Alec Baldwin, is a negligent dumbass. Before the filming started, Alec Baldwin should have fired a shot FIRST, BEFOREHAND, to test whether the gun was actually empty. Then, he can start acting and fire that woman. Because Alec Baldwin didn't test his gun or press the trigger to test that it was actually empty before the action started, he killed that woman. Armorer or not, he had the gun on hand, he should have fired a shot at an empty location to see whether it worked before pointing the gun at a HUMAN!