A quick definition of willful murder:

Willful murder is when someone intentionally kills another person without any valid reason or excuse. It is a very serious crime and is often punished with a long prison sentence or even the death penalty. There are different types of murder, such as first-degree murder, which involves planning and premeditation, and second-degree murder, which is not premeditated but still intentional. Murder is different from manslaughter, which is when someone unintentionally causes the death of another person.