Nothing, it was cleared through the local DA. Didn't happen to me but my mother. She shot/killed an intruder (that had already been to prison once for murder) in her home that beat the crap out of my sister with a tire-iron (almost killed her) and was heading for my mother. She never got arrested, even got the gun back. This was back in '98/TX.
"Four wheels move the body. Two wheels move the soul."