She was the “most beautiful woman in Puppetland” in the 1980s children’s show starring Paul Reubens, and more recently had a recurring role in “It’s Always Sunny in Philadelphia.”

The actor who played Charlie's mother in "It's Always Sunny in Philadelphia" and starred in "Pee-wee's Playhouse" died at age 78 on Friday, a spokesperson for the actress confirmed to CBS News.

The actress had recently finished filming for another season of "It's Always Sunny in Philadelphia" and her forthcoming pickleball-related film, "Dink."

Stewart had a memorable role on the beloved comedy series “It’s Always Sunny in Philadelphia,” playing Charlie Kelly’s mother, Bonnie.