John Henson, Muppets puppeteer and son of the late Jim Henson, has died at the age of 48.

The puppeteer passed away on Friday (February 14) from a sudden heart attack.

“It is with great sadness that we confirm that John Henson… died at age 48 of a sudden massive heart attack… while at home with his daughter,” the Jim Henson Company said in a statement on Facebook.

They added, “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.”

We send our thoughts and prayers to John‘s family and friends during this difficult time.