Jimmy Buffett's cause of death has been revealed as skin cancer that turned into lymphoma. He was diagnosed with skin cancer four years ago and lived his life in the sun. He began receiving hospice care and passed away peacefully on September 1st surrounded by his family, friends, and music. Tributes were posted to social media by country artists Alan Jackson and Kenny Chesney. Buffett will be missed by many as he lived his life like a song until the very end.