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 78-year-old actor starred as Miss Yvonne originally ... the mother of Charlie King, played by Charlie Day. Stewart appeared in 18 episodes from 2005-2023, according to IMDb.