John Henson Suddenly Passes Away at 48, April 25, 1965 - February 14, 2014

All of us here will miss John Henson, partner of The Jim Henson Company and son of Jim & Jane Henson. April 25, 1965 - February 14, 2014
— Jim Henson Legacy (@JimHensonLegacy) February 15, 2014

From The Jim Henson Company's Facebook Page:
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.