Cat killer on loose after poisonings. A cat killer is believed to be on the loose after nine animals were fatally poisoned with anti-freeze.telegraph.co.uk. November 06,  2008. The animals were rushed to Bilston Vet Clinic in the Black Country suffering with kidney failure and later had to be put down. Vets now fear that unless the culprit is found, the poisoning spree will continue and the lives of more cats will be at risk. [ See ]. Own image. Click on to expand.