Nutmeg, believed to be the world's oldest cat, died in England at the age of 32 earlier this month, his owners said.
"Westway Vets is sad to announce the passing of Nutmeg, a cat thought to be the world's oldest moggy," the vet group said.
"After an incredibly long life, Nutmeg, who was 32, suffered heart failure after coming to us with breathing difficulties."
Liz and Ian Finlay cared for Nutmeg for 27 years after taking him in as a stray when he was 5 years old.
"He suffered from a bad tooth and he had rasping breath. We knew that when we went to the vets that he wouldn't be coming home. It was an unspoken solace."
Finlay and his wife said their other cat Spice, who died in the early 2000s, constantly brought Nutmeg into their home before they decided to adopt him.
Finlay attributed Nutmeg's long life to healthy portions of treats such as tuna, cream and hot roast chicken.
"Obviously he had such a long and good life - we spoilt him rotten. I would have loved a little more time with him, but that is just being selfish," he said.