Mostly, when it comes to cartoon deaths, it either happens off screen or it is heavily implied but never directly shown, or it is not graphic in nature. Rarely have I seen blood in a cartoon series, maybe a small cut, but nothing particularly life-threatening. In some cases, the death is a tease (Young Justice, for instance, likes to tease everything from twincest to impalement). Oh yeah, and the person dying seems to have to be at a certain age- an adult, mostly- to die. Children are immortal in cartoons.