What a total sick freak! I really hope somebody gets him eventually, people like him should be locked up indefinately. It's about time laws were changed and abuse/killings of an animal is given the same sentence as murder for humans, he should be stuck away for life. He obviously has serious problems and needs to be stopped, people like him do not change with counselling or prison terms, they keep re-offending, they never stop.
I've no doubt he's probably done something similar to humans somewhere along the line, and if he progresses like he is with animals eventually somebody somewhere will be murdered, possibly a child as they are easier pray than adults.
Somebody wants to seriously keep an eye on him before he does anymore serious harm be it to and animal or human.