Baldwin should be charged, as he was, with involuntary manslaughter, which involves the “commission of a lawful act which might produce death … without due caution.”
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Handling weapons, like transporting vinyl chloride or bungee jumping, requires a certain level of care. As any graduate of a concealed-carry course can tell you concerning guns, the requisite level of care involves four elements. First, always keep the firearm pointed in a safe direction, even when dry firing. Second, treat all guns as though they are loaded. Third, keep your finger off the trigger until you are ready to shoot. And four, always be sure of your target and what’s beyond it. Baldwin failed them all.
Remember, involuntary manslaughter involves an act that causes death “without due caution.” By failing every gun-safety rule, Baldwin acted without due caution. This is an easy case.
Baldwin’s only conceivable defense would be that he did not realize the gun was real, in which case he would have been using appropriate caution for a fake gun. But he knew the gun was real and instead claims he never pulled the trigger. That is far-fetched, and even if true, he still failed Gun Safety 101. So he is still liable for involuntary manslaughter.