Former cop, different State here.

Someone else mentioned the fact that most people are killed with their own guns when confronting an intruder. Someone also mentioned the fact that since the intruder is nude, he's possibly disturbed, or maybe even on drugs. Until you've fought someone on PCP, you just can't understand how someone of small stature can whip up on a big guy. In most fight situations, the losing party usually loses simply because the pain factor overwhelms their urge to continue to battle. In alot of cases where a subject is high, or delusional, they have no pain, therefore your attempts to subdue or injure is fruitless.

The fact that someone has forced entry into your home (1st degree burglary in Oklahoma if it is occupied at the time) and the fact that the subject is not wearing clothing tells me he is up to no good. (should be obvious). At this point, you don't hesitate, you don't look him in the eyes, you don't even warn the maggot. You fire center mass until the subject is no longer a threat. If he survives, well, you wounded him. If he doesn't, well, he won't be around to sue you for it. There have been cases here where a homeowner has even chased an intruder back into the street and shot him. No prosecution. In Oklahoma, you don't have to be in danger of losing your life, all you have to be is "in fear of death or great bodily harm".