@krellin,
The instances in which a prosecutor will refrain from charging a person who has killed another person are exceedingly rare.
@Amon,
There is no question about defending myself or my family. From the training that I have received it's best to do everything to avoid the situation to begin with. However, tragically, sometimes those situations are unavoidable. But, there are things that one can do (or not do) to make a successful defense more like should such a horrible situation arise.
First and foremost, do NOT "lay in wait" for an intruder. Meaning you wake up the sound of broken glass, you get your gun, and you take a defensive position and wait for the intruder to walk into your field of fire and you blow him away. Sensible, given the unknown circumstances of the situation, but in the eyes of the law, NOT GOOD. I am not saying it's an automatic conviction, but the DA is going to ask you whether you made any attempt to alert the intruder that you were there and that you were armed. Sounds stupid in a potential life or death situation to give up the advantage of surprise, but remember the defendant has to show conclusively that he had a reasonable fear for his life, or the life of his family. The DA is going to do everything that they can to make it look like you weren't afraid, but that you just wanted to blow the intruder away. If you were so scared why didn't you call the cops? etc. Did you know the intruder was armed? Was he, aside from his presence in your home, threatening you? Now, in Texas and other states the mere presence of an uninvited person in your home at night is considered a "threat." But, that is not going to stop the DA from making you prove legally that you were scared for your life.
I was taught by a former cop and DA that building a case starts outside the home. Signs saying that owners of the house are armed. Yeah, could attract thieves, but not very likely. Second, once someone is in your home immediately do several things. 1) call the cops, tell them specifically that someone is in your home, that you are armed and that you are SCARED FOR YOUR LIFE; 2) turn on the light; 3) shout as loud as you can, "I am armed, I have called the police, I am scared for my life, do NOT come towards me!" Sounds silly tactically, but you're doing several things to help the situation. First and foremost you're giving the intruder an opportunity to flee and avoid anyone getting hurt. Not very macho, but better for everyone. Second, you're establishing to the police, the intruder, and possibly your neighbors (who WILL be questioned as witnesses) that you were scared for you life, and that you made everyone aware that you were armed. I know to big tough guys this sounds stupid. But, if that intruder then does advance on you and you are forced to shoot him, your chances of a successful defense go up astronomically, as do your chances of not even being charged.
Just some thoughts.