This is truly horrifying. Can you even imagine what these cats went through before they died?! We can only hope that at the very least it was quick however this must be someone very, very disturbed with patterns of a psychopath oh god...
One of my cats was killed by a crazy guy. He has schizophrenia and his parents let him lose and he skips his medications. It's one of your worst fears and it happened. Not even that but they got him a German Sheppard.
Anyways to stay on topic I hope they catch this nut job really soon.
" How we behave toward cats here below determines our status in heaven."
- Robert A. Heinlein