He said he was "devastated to have failed in my duty to my hero" - a reference to late Muppets creator Jim Henson. Whitmire took over as Kermit's handler and voice actor after Henson died in 1990.

Five of the original Muppet performers come together for the first time ever to share behind-the-scenes secrets of the Muppets. Includes rare performance footage, surprising stories and insights ...