8.9: Summary

Homicide is the killing of one human being by another. Criminal homicide is either murder or manslaughter. Some states and the federal government also criminalize the killing of a fetus. Suicide is usually not criminal, although assisted suicide could be.

Many jurisdictions follow the common law and define murder as the killing of a victim with malice aforethought. Malice can be either a specific intent to kill, which is express malice, or the intent to do serious bodily injury, or depraved heart, which is implied malice.

Most jurisdictions divide murder into degrees of seriousness. First-degree murder is the most serious, can merit the death penalty in certain jurisdictions, and generally includes premeditated murder, murder by a specified means, and serious felony murders. Premeditated murder is typically a killing supported by specific intent to kill combined with cool reflection and planning. Murder by a specified means is killing with a specific heinous method. Felony murder is a homicide that occurs during the commission or attempted commission of a felony. Felony murder lacks murder intent; the defendant need only possess the intent required for the felony. Felony murder can be graded as first, second, or third degree, depending on the felony.

Second-degree murder is defined as any murder that is not first degree. Typically, second-degree murder intent is the intent to inflict serious bodily injury or a depraved heart intent. Second-degree murder is usually classified lower than first-degree murder but higher than manslaughter.

In California manslaughter is an unlawful killing without murder intent. Most jurisdictions divide manslaughter into voluntary and involuntary. Voluntary manslaughter is a killing that occurs during a heat of passion inspired by adequate provocation from the victim, negating murder intent. Involuntary manslaughter can be a killing that occurs during the commission or attempted commission of a misdemeanor or a reckless or negligent killing, depending on the jurisdiction. Involuntary manslaughter can also be vehicular manslaughter when the killing occurs while driving a vehicle recklessly, negligently, or under the influence of alcohol or drugs.

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