Is involuntary manslaughter a misdemeanor or a felony?

Involuntary Manslaughter is in fact a Felony.

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The difference between manslaughter and involuntary manslaughter is that voluntary manslaughter requires an intent to kill someone or cause serious bodily harm while involuntary manslaughter does not.

The "battery" portion of the question implies that this would be a felony offense. Plain "simple assault' is a misdemeanor.

Yes