Whether a violation of Penal Code section 273a can constitute the “unlawful act” supporting involuntary manslaughter when the defendant lacked criminal intent or criminal negligence.
Holding
No. An act is not an “unlawful act” for involuntary-manslaughter purposes unless it is dangerous to human life or safety and was committed with criminal intent or criminal negligence.
Reasoning
Penal Code section 192 defines involuntary manslaughter to include a killing committed during an unlawful act not amounting to a felony, or during a lawful act performed without due caution and circumspection. But Penal Code section 20 generally requires a union of an act with wrongful intent or criminal negligence for every crime, and nothing in section 192 excludes that requirement.
The Attorney General argued that leaving the children endangered violated Penal Code section 273a and therefore supplied the required unlawful act. The court rejected that shortcut. Under People v. Stuart, section 20 applies to the phrase “unlawful act” in section 192 as well as to the phrase “without due caution and circumspection.” A misdemeanor violation cannot support manslaughter merely because an injury or death followed; the conduct must also satisfy the criminal-intent or criminal-negligence requirement.