The Addams Family star Ken Weatherwax, who played the role of inventive son Pugsley on the hit 1960s television series, has died. He was 59-years-old.

According to an announcement posted by Ken’s niece, Shanyn Vieira, on Facebook, the actor passed away on Sunday, Dec. 7 from a heart attack.

“Just want to let you know that my uncle Ken Weatherwax who played Pugsley from ‘The Addams Family’ died today from a heart attack,” Vieira wrote. “So when you hear the theme song, please think of me!!!”

ken weatherwax 'addams family'

Ken with his ‘Addams Family’ costars in June 1964.

Two funerals are reportedly being planned — one for family, another for fans — to honor the former child star.

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Ken starred on ‘The Addams Family’ alongside John Astin (Gomez Addams), Carolyn Jones (Morticia Addams) and Lisa Loring (Wednesday Addams) from 1964 – 1966 on ABC.

His other acting credits include a string of toothpaste commercials and a 1964 episode of ‘Wagon Train.’ In 1977, he reprised his role as Pugsley for a Halloween-themed ‘Addams Family’ TV movie on NBC.