Jimmy Buffett died of a rare and aggressive form of skin cancer called Merkel cell carcinoma. He had been battling this disease for about four years before passing away peacefully at his home in Sag Harbor, New York, on September 1, 2023, at the age of 76. This type of skin cancer is quite rare, with only around 2,500 cases diagnosed annually in the U.S., and is known for its rapid progression and high lethality. Despite his illness, Buffett continued to perform during treatment until his health declined in the final weeks.