Does the court have a sua sponte duty to instruct on involuntary manslaughter?

"[W]hen the evidence presents a material issue as to whether a killing was committed with malice, the court has a sua sponte duty to instruct on involuntary manslaughter as a lesser included offense, even when the killing occurs during the commission of an aggravated assault. [Citations.] However, when . . . the defendant indisputably has deliberately engaged in a type of aggravated assault the natural consequences of which are dangerous to human life, thus satisfying the objective component of implied malice as a matter of law, and no material issue is presented as to whether the defendant subjectively appreciated the danger to human life his or her conduct posed, there is no sua sponte duty to instruct on involuntary manslaughter. [Citations.]" (People v. Brothers, supra, 236 Cal.App.4th at p. 35.)