The Jim Henson Company has announced the tragic death of John Henson, son to Muppets creator, Jim.

John, who was a board member of The Jim Henson Company, died suddenly of a heart attack after building an igloo in the snow with his daughter.

The company’s statement read: “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 followed in is his father’s footsteps and was also a puppeteer for the company, working on a number of Muppets projects, including Muppet Treasure Island.

Our thoughts are with the Henson family.