A person who commits suicide is also called a suicide. Or..."dead" is probably a good word for it. :)
Regicide
a murderer.
a butcher
When someone kills another person in self-defense, it is often referred to as "justifiable homicide." This legal term applies when the use of lethal force is deemed necessary to protect oneself from imminent harm or death. The justification typically requires that the force used was proportional to the threat faced. Laws regarding self-defense can vary by jurisdiction.
A self - eater, i think.
sasuke kills him after deidra attempts self destruct.
A person who kills plants is generally referred to as a "plant killer" or someone with a "black thumb."
Romeo and Juliet kill them self's. Romeo kills himself with poison and Juliet kills her self with Romeos Dagger.
It's called, Self-Cannibalism. It's a disease.
When a person intentionally kills themselves, it is called suicide.
Someone who is obsessed with themselves is commonly referred to as narcissistic or self-absorbed.
It would be considered Manslaughter if it was an accident. So the convicted would just be sentenced for some sort of Manslaughter.