Killing involves the termination of life. It may be lawful or unlawful.
Lawful forms of killing may include:
- justifiable homicide, including killing in self-defense
- execution by the state
- killing sanctioned by religious authority
Unlawful killings involving "malice aforethought" constitute murder.
Unlawful killings not involving "malice" may be termed manslaughter or homicide.
The killing of oneself is called suicide.