The last Muppet production was done on May 4th 1990 before Jim Henson passed away.
Jim Henson created the Muppet puppets along with his wife Jane Henson. Jim Henson died from cancer in 1990 and Jane died in 2013 but his company still makes Muppet movies.
No, that was Jerry Nelson who worked with Jim Henson. His daughter (Christine Nelson) had cystic fibrosis, born in 1960 and died 1982. She had a small speaking part in one of the Muppet Movies a year before she died. Her mother wrote a book about her "Give me one wish". In the book it mentions that Jim Henson gave her a speaking part so she could become part of the actor's union.
Matthew henson was 88 when he died.
Hensley Henson died in 1947.
Philip Henson died in 1911.
Rosa Henson died in 1997.
Douglas Henson died in 2003.
Leslie Henson died in 1957.
Jim Henson created Kermit in 1955 & voiced & performed him until his death in 1990.Steve Whitmire began performing & voiced Kermit until July 2017.Now Matt Vogel has taken up performing & voicing Kermit.
Richard A. Henson died on 2002-06-12.
William Samuel Henson died in 1888.
Andrew Henson Allen died in 1963.