From www.wdwinfo.com

The Muppets' John Henson passes away at age 48
Feb 15, 2014

John Henson, son of Muppets creator Jim Henson, passed away suddenly on Friday, February 14. Henson, 48, had a heart attack at his home in Saugerties, New York. He followed in his father's puppeteering career and was the puppeteer for Sweetums the ogre from 1996-2005. One of his performances was playing Sweetums for the video portion of Muppet Vision 3D at Disney's Hollywood Studios.

The Henson Company released a statement, saying, "It is with great sadness that we confirm that John Henson, son of Jim and Jane Henson and brother to Lisa, Cheryl, Brian and Heather, died at age 48 of a sudden massive heart attack on Friday, February 14, while at home with his daughter. John served as a shareholder and board member of The Jim Henson Company. He leaves two daughters, Katrina (15) and Sydney (10) and his wife Gyongyi. A private service is being planned."