I'm sooooo sorry! You must put a camera and locks on your coop immediately, and report this to the police. This guy is not going to stop bullying and clearly considers himself above the law. You need to collect evidence, and since he doesn't mind hurting animals, be very cautious, as he probably wouldn't mind hurting a human.
Stay on your toes! I'd also put motion detector lights all around, but not until I have a camera set up. Don't make the camera visible or you'll never catch him.