Mary Kay Bergman
From South Park Archives
Mary Kay Bergman, AKA Shannen Cassidy (June 1961-November 1999) was a voice actress who served as most of the female voices of South Park from Cartman Gets an Anal Probe all the way to near the end of the third season. She committed suicide by gunfire right after Hooked On Monkey Phonics aired. After her death, Eliza J. Schneider took over most of her roles in the series. Mona Marshall took over the role of Sheila Broflovski. Among the characters she portrayed are:
