Mary Kay Bergman (born June 5, 1961-died November 11, 1999) was an American actress, who voiced Daphne Blake from Scooby Doo, Jay Jay the Jet Plane, Herky, Savannah, and Revvin' Evan on Jay Jay the Jet Plane, Jessie (The Yodelling Voice) from Toy Story 2, Wendy Testaburger, Sharon Marsh, Liane Cartman, Carol McCormick, Principal Victoria, Mayor McDaniels, Shelly Marsh, Sheila Broflovski, Ms. Crabtree, and Barbara Streisand from South Park, and Timmy Turner on Oh Yeah! Cartoons.
She passed away back in 1999 from suicide by gunfire.