Marcia Wallace, best known for her role on The Bob Newhart Show and her voice work on The Simpsons, died on Saturday. She was 70.

Wallace’s cause of death was not immediately confirmed. However, reps for The Simpsons have stated that they knew Wallace, who voiced Bart’s fourth grade teacher Edna Krabappel, had been gravely ill for some time, according to Entertainment Weekly. Wallace’s son Mikey Wallace claimed that pneumonia complications, not a breast cancer relapse, was the cause of his mother’s death to TMZ.

Wallace had voiced Mrs. Krabapple since The Simpsons premiered in 1990 and won an Emmy and renewed fame for her work on the show. "I was tremendously saddened to learn this morning of the passing of the brilliant and gracious Marcia Wallace," Simpsons sexecutive producer Al Jean said in a statement. "She was beloved by all at The Simpsons and we intend to retire her irreplaceable character."

Back in the 1970s, Wallace starred as Carol Kester on The Bob Newhart Show, who worked as a secretary for Dr. Bob Hartley, sharing her boss’s office suite. She reprised the iconic character on Murphy Brown in 1994. Her guest appearance earned her an Emmy nod.

Throughout the 70s and 80s, Wallace frequently made guest appearances on popular TV shows of the time, including The Love Boat, Charles in Charge and Magnum, P.I.

Wallace is survived by her son Mikey, her sister Sherry Wallace and brother Jimmy Wallace.

– Chelsea Regan

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