"Prince Chunk's" owner said that he died in his sleep on Sunday.
He was about 10 years old and suffered from heart disease.
The white tabby gained fame when he was found wandering the streets, after his owner lost her home to foreclosure.
When the animal shelter took in Prince Chunk in august of 2008, he weighed 44 pounds, just shy of a world record.
He appeared on good morning america, and was featured in people magazine.