Is a court's decision not to instruct the jury on the defense of involuntary manslaughter prejudicial?

Assuming only for purposes of argument that sufficient evidence justified instructing on involuntary manslaughter, we conclude the court's decision not to instruct on the defense was not prejudicial. " 'Error in failing to instruct the jury on a lesser included offense is harmless when the jury necessarily decides the factual questions posed by the omitted instructions adversely to defendant under other properly given instructions.' [Citation.]" (People v. Chatman (2006) 38 Cal.4th 344, 392.)