John Henson, a second-generation puppeteer, has died at age 48. Henson — son of Muppets creator Jim Henson — suffered a sudden heart attack on Friday. The news was confirmed by the official Facebook page for the Jim Henson Company, of which John Henson was a shareholder and board member. The younger Henson also worked on several Muppets projects, playing the character Sweetums in films including Muppet Treasure Island and Muppets From Space. He is survived by his wife, Gyongyi, and two daughters.