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MURDER, FIRST DEGREE
In order for someone to be found guilty of first degree murder the government must prove that the person killed another person; the person killed the other person with malice aforethought; and the killing was premeditated.
To kill with malice aforethought means to kill either deliberately and intentionally or recklessly with extreme disregard for human life.
Premeditation means with planning or deliberation. The amount of time needed for premeditation of a killing depends on the person and the circumstances. It must be long enough, after forming the intent to kill, for the killer to have been fully conscious of the intent and to have considered the killing.
First-degree murder in California includes a killing that is "willful, deliberate, and premeditated," or that is committed in the perpetration, or attempt to perpetrate, certain felonies, including burglary, and not including the petty offense of shoplifting. Cal. Penal Code S 189.