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Mary Kay Bergman (June 5, 1961 – November 11, 1999), also credited as Shannen Cassidy, was an American voice actress and voice-over teacher. She was the lead female voice actress on South Park from the show's debut in 1997 until her death. Throughout her career, Bergman performed voice work for over 400 television commercials and voiced over 100 cartoon, film, and video game characters. Born in Los Angeles, California, Bergman had an interest in fantasy and animation early in her life. Wikipedia