Is it legal to kill your roommate's cat???

I had a problem with neighbors cat tearing up my car cover. Wanted to pull a full roman event on him. Kill the overfeed piece of s@%t & hang his head in a visible location as deterent to other cats. My wife prevailed & now I have 2 cat scrams( $35 ea.) that send an ear piercing sound to cats when they get within 60'. Had them a year & work great,just replace 9v battery twice a year. I feel your pain. Good luck & that sucks. Cat's can wander all over the f@$king place but let a dog free without a leash. Makes no sense.

Oldschoocuda