U.S.A. –-(AmmoLand.com)- In the law of self-defense of almost all states, If a person is attacked, and reasonably fears for their life, they may legally defend themselves with deadly force. A small minority of states require a person to retreat from the situation if they can do so in complete safety.
In all states of which I am aware, a person may not use deadly force in self-defense, if they provoked the attack with the intent of using deadly force.
It is not legal to start a fight so the person who started the fight can kill someone who they provoked.
