Everyone knows about Homicide (the killing of another human being), Suicide (the killing of oneself), and Regicide (the killing of a monarch). Here are some of the "Cides" you didn't hear about in your criminal justice class.
The killing of a person during an attempted rescue, unwittingly, by the rescuer.
The removal of an existing person by the killing of ancestral bodies that would otherwise lead to that person's creation. Requiring time-travel, as popularized in James Cameron's Terminator series.