From what I can see it's an open and shut case. It was Valentines Day, he asked her to marry him, she wouldn't commit to a relationship with a gun obsessed, steroid-abuser in need of anger management therapy, they had an argument, he went for her with a cricket bat, she ran and locked herself in the bathroom, he tried to smash the door in with the bat, frustrated with his failure to get to her he got a gun fired through the door killing her in the process. That's my guess. Case closed. Send him down.