The dude's a bad egg. Regardless of how much someone deserves an ass whoopin', civilized people don't go around beating people over the head with a foreign object.
Considering his history, it's easy to see he fits the definition of a lifer. It's a shame, but the kid will live out the majority of his life behind bars without some serious change of heart.
Country, if this got to you this badly, you may want to go to your employer's HR dept and see if they have any programs that could help you professionally sort this out.