Yeah, I too offer my condolences. It sucks to lose your cat to an unfortunate accident like that. However, its even worse to lose them to a criminal act of premeditated violence.
We always had cats when I was a kid. Every so often, one of our indoor/outdoor cats would go missing. When they did come back, several times the cat of the moment would have terrible sores in their mouth, which would cause them to refuse to eat because of the pain, and eventually they would pass away. We attributed it to some kind of natural pathology of outdoor cats, and said our goodbyes and buried the cat out by the apple tree in the back yard. After the 3rd occurrence of this however, my folks thought there was too much coincidence, so they took our cat to the vet to see what they could tell us about the situation...
This is where the fury begins...
The vet told us that the sores in the cats mouth was actually an ACID burn, probably the muriatic kind of acid readily available at hardware stores, and used for cleaning septic tanks and stripping wood etc. This is a tasteless and odorless clear liquid. It can be easily added to almost any food and will cause instant burns to the mouth and esophogus not to mention the rest of the digestive tract if the food reaches that far before regurgitation.
We though "who could be so cruel"?? Turns out, the berkleying old bastard who lived across the street could. You know the guy...the "get off my lawn, im keeping the frisbee that landed in my yard, quit making all that racket" old guy that lives in every neighborhood. One of his neighbors overheard him talking to his wife out on his porch, telling his wife about how proud he was to be "ridding the neighborhood of those smelly a$$ cats" and how it was his "right since the cats were trespassing on his yard". This neighbor told my folks (my bro and sis were friends with his kids, so he knew of our plight). My dad confronted him about it and tried to be rational with him. When my dad wouldnt let it go and threatened to call the ASPCA, the old man began spewing obscenities at my old man, who took it all in stride given the situation. But it was when the old F-er told my dad that his kids would get it too if we ever set foot in his yard that my dad knocked a 60 year old man clean out in his front doorway. Hindsight being what it is, definitely not his best moment, and he doesnt like to talk about it these days, but that old guy moved 3 weeks later, and no more feline carnage was ever visited upon our street henceforth....and the only thing that ever kept one of our frisbees after that was a roof