Marcia Wallace Dead — ‘Simpsons’ Star Dies at 70

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Marcia Wallace — who voiced Edna Krabappel on “The Simpsons” — died last night in Los Angeles … our sources has learned.

Marcia”s caregiver tells us … the actress passed away at home with her family by her side.  We”re told she had been sick for the past few months … but the caregiver couldn”t go into specifics.

Wallace has been on TV since the 70″s — and spent 3 decades on various game show panels like “Hollywood Squares”, “The $25,000 Pyramid” and “Match Game” … as well as receptionist Carol Kester on “The Bob Newhart Show.”

The actress was also a huge activist for breast cancer … after being diagnosed with the disease in 1985.

She was 70.