From Wikipedia, the free encyclopedia. Sandra Peabody (born 11 January 1948) is an American film and stage actress, screenwriter, producer and acting coach. She is best known for her role as Mari Collingwood in Wes Craven's 1972 film The Last House on the Left (1972). A cult hit, the film established her as a prominent actress in horror, and she subsequently starred in Voices of Desire (1972), Ma... show more