Marcia Wallace, the voice behind "The Simpsons" character Edna Krabappel, has died, OTRC.com has learned. She was 70.
Wallace's agent confirmed the news Saturday to OTRC.com but would not comment further on the cause of death or give any other details.
Though Wallace was likely best known as the voice of the jaded educator at Springfield Elementary in the long-running animated FOX show, Wallace also held the role of Carol Kester, the lovelorn and wise-cracking receptionist in the 1970s comedy sitcom, "The Bob Newhart Show."
Wallace also made appearances on Candice Bergen's "Murphy Brown."
"Simpsons" executive producer Al Jean said in a statement Saturday to the Associated Press that her death is a terrible loss. He says Wallace's "irreplaceable character" would be retired from the show.
Some of Wallace's co-stars took to Twitter to express their grief over the actress' death.
"Cheers to the hilarious, kind, fab Marcia Wallace, who has taken leave of us," wrote Yeardley Smith, who voices "Simpsons" character Lisa. "Heaven is now a much funnier place because of you." Smith's Twitter account, which was functioning earlier Saturday, appeared to be down as of 11 a.m.
"Sad to learn--through Twitter, first--of the passing of the wonderful Marcia Wallace. Sorely missed already," wrote Harry Shearer, who voiced several "Simpsons" characters, including Ned Flanders, Principal Skinner and Kent Brockman.
Cathryn Michon, who directed Wallace in the upcoming movie, "Muffin Top," wrote, "Devastated 2nite at passing of #Marciawallace dear friend 1 of the stars of my @MuffinTopMovie. She was my hero, cheered 4 me. Grrl Genius."
The Associated Press contributed to this report.