And never, ever call the police afterward.
That turns it from justifiable homicide into murder/manslaughter.
Why not? There's a dead body in your house, lots of blood, and you've legally and legitimately made it dead. If you don't call the cops and attempt a private disposal, all it does is raise unnecessary questions about the legitimacy of the shooting. The best thing to do is call your lawyer and then call the cops. That way you've got legal protection when you most need it and you've not done something silly that could raise questions about the legality of the shooting. I've lived here in the Knoxville, TN for about the last 19 years, there have been a number of such legal and legitimate shootings, and I don't know of one that's resulted in the shooter being prosecuted. Equally important, the fact that you called the cops can be used as evidence of your good faith in a subsequent civil case like this.