@cellmania: I’m pretty sure I know the case you are talking about. I will not disclose names in order to respect the family’s privacy.
A nine year-old girl had apparently been raped by her uncle. She never told anyone because he threatened her. After five years, she finally told her mother. The mother got in her car and drove to the uncle’s place of business. She called him into the parking lot and confronted him. He did not deny the allegations. Instead, he allegedly said, “What are you going to do about it?”
According to court transcripts, the mother admitted shooting him five times, reloading her gun and shot five more times, killing the supposed perpetrator. She then drove to the police department and turned in her gun. She advised them there had been a shooting.
At her first trial, she was acquitted of first-degree murder. People called it vigilante justice. She was then charged with second-degree murder but was only found guilty of voluntary manslaughter. She was sentenced to four years in prison. It was reduced, by appeal, to six months. I think she only served two months, however.