The wooden puppet was introduced in the BBC program "For the Children" in 1946 and was a regular until 1955 when the shows host, Annette Mills, died, the BBC reported Monday.
The character returned to the BBC in 2005 in animated form and is watched by about 300,000 children each week.
Annette Mills was the sister of actor John Mills.
Actress Judi Dench told the BBC, "I remember how Sir John Mills was so incredibly proud of his sister Annette when Muffin became such a huge success -- and rightly so."
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