(CNN) -- Marcia Wallace, whose four-decade television career included playing the secretary on "The Bob Newhart Show" and Bart's fourth-grade teacher on "The Simpsons," has died, her agent said Saturday.
Wallace was 70, according to
imdb.com. Her cause of death was not immediately confirmed.
Wallace starred for six seasons as Carol Kester on "The Bob Newhart Show" in the 1970s and reprised the role in the 1990s on "Murphy Brown."
But it was her Emmy-winning role as Edna Krabappel, Bart Simpson's teacher with the snarky laugh, that may have earned her the most fame in recent years. It was a part she held since the show's premiere in 1990.
Wallace was a regular guest star on a host of popular TV shows in the 1970s and 1980s, from "The Love Boat" and "Fantasy Island" to "Gimme a Break!", "ALF," "Night Court," "Charles in Charge" and "Magnum, P.I."
She was also a mainstay of TV game shows such "The Hollywood Squares," "Password" and "The (New) $25,000 Pyramid" and starred in numerous stage productions including a touring production of "The Vagina Monologues."
In recent years, Wallace also advocated for awareness of breast cancer, a disease she battled herself. Her 2004 book, "Don't Look Back, We're Not Going That Way," in part chronicled her fight with breast cancer.
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