Period, end of story....or should have been.
Is there a law that states how many times you can shoot a perp who breaks into your home?
Yes. Actually, the law is pretty clear on this matter. You can use lethal force to stop a threat. What you can't do is execute people regardless of whether or not one believes they deserved to be removed from the gene pool.
And Byron Smith will soon be joining Jerome Ersland as teaching examples to those among us who still remain confused.
I doubt that there is legislative language but I can assure you that it is a prosecutor's issue and he or she can nail your aXX to the wall for murder if you shoot to kill after the threat is negated.
I can distinctly remember the instructions given to me by an NRA instructor, who was himself a retired LEO. He said you keep shooting until the threatening person falls to the ground and then you stop. You definitely stop at that point. Any further and you can be charged with murder. And I think Mr. Smith will be charged with murder.