I wanna know more! Wacking an intruder, burgler, or protecting yourself is one thing, but it sounds like there's more.
It sounds like this may be murder. The guy was an ex- or maybe current boyfriend of the daughter, and the neighbors report that his car had been at the house all day. He had a key to the house. He was shot twice at short range in the face. The father is known to have disliked him. To me it looks like maybe he and the daughter got back together and the father got home and found him there and wasn't too pleased about it, or perhaps the father was there at the same time and they had an argument.
http://www.local10.com/news/4718163/detail.html