First-degree murder is defined as an unlawful killing that is both willful and premeditated, meaning that it was committed after planning or “lying in wait” for the victim. For example, Dan comes home to find his wife in bed with Victor.
Second degree murder is generally defined as intentional murder that lacks premeditation, is intended to only cause bodily harm, and demonstrates an extreme indifference to human life. The exact legal definition of this crime will vary by jurisdiction
Third-degree murder is defined as killing someone unintentionally and not done as part of the commitment of another felony. Another term for murder is “homicide.” Third-degree murders are those committed with ill will, or, in other words, with malice