This happened recently. A licensed concealed carrier was attempting to help his screaming neighbor who was being attacked by two dogs. In the process of drawing his gun he unintentionally fired an round, striking her in the lower back. She later died of the injury.
Unfortunately, he has to wait for the determination of whether he will face any charges. It looks like a case of poor trigger discipline, but I'm keeping an eye on the story.
Detroit man calls shooting death of dog attack victim an accident