Easy one, he will be charged and found guilty, probably accept a plea to a lesser charge.
A person claiming self-defense must prove at trial that the self-defense was justified. Generally a person may use reasonable force when it appears reasonably necessary to prevent an impending injury. A person using force in self-defense should use only so much force as is required to repel the attack. Nondeadly force can be used to repel either a nondeadly attack or a deadly attack. Deadly Force may be used to fend off an attacker who is using deadly force but may not be used to repel an attacker who is not using deadly force.
In some cases, before using force that is likely to cause death or serious bodily harm to the aggressor, a person who is under attack should attempt to retreat or escape, but only if an exit is reasonably possible.