Ken Weatherwax has died at the age of 59.
The actor passed away following a heart attack during his sleep at his California home, according to Examiner.com.
Weatherwax was known for playing Pugsley on the Addams Family TV series, which ran from 1964 until 1966.
TMZ claims that the star's family have said two funerals will be held for Weatherwax, for his family and his fans respectively.
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Weatherwax went on to play Pusley Sr in the 1977 TV movie Halloween With The New Addams Family, and also voiced the character in the animated series, from 1973 until 1975.
He regularly took part in Addams Family fan events and reunions.
Weatherwax returned to education after the original show ended but was bullied and expelled from many schools.
He joined the US army at the age of 17 and later went on to become a set builder and studio grip.
Weatherwax was the nephew of the late musical star Ruby Keeler, and is survived by his 70-year-old brother Joey D Vieira (also known as Donald Keeler), who starred in Lassie as Porky.
The surviving cast members of The Addams Family are John Astin, 84, who played Gomez, Lisa Loring, 56, who portrayed Wednesday and Felix Silla, 77, known for his role as Cousin Itt.
- Daily Mail