Scott Rudy finds out that his girlfriend is cheating on him with his best friend. Scott goes over to his best friend's house and finds his girlfriend and his best friend in a compromising embrace. Scott takes out his gun, and shoots and kills both of them. Scott is arrested and charged with two counts of murder. At his trial Scott claims he was insane at the time of the murder as his defense. Having the accused and the accuser fight one another to decide guilt or innocence is referred to as trial by