died of being himself

In 1896 William Morris died at the age of sixty-two. Morris was one of the most talented and respected figures in the Victorian Era, but the superhuman range and pace of his vocations—painter, architect, designer, craftsman, writer, book-maker, socialist crusader—caused one physician to attribute his death to "simply being William Morris, and having done more work than most ten men."

http://www.todayinliterature.com/stories.asp?Event_Date=10/3/1896