i Register
In some senses, self-death is marked as euphemistic, rare. Watch for register when choosing this word.
noun
Suicide.
Psychiatry may have a name for this form of cessation, but it isn't hard to see something of that notion in the self-deaths of creative artists who have either sought to push the very edges of corporeal existence or who have died because they couldn't find a way of truly validating their talents and their livingness.
Apoptosis.
verb
To commit suicide.