Wilma Jeanne Cooper (October 25, 1928 – May 8, 2013) was an American actress, best known for her role as Katherine Chancellor on the CBS soap opera The Young and the Restless (1973–2013). At the time of her death, she was eighth on the all-time list of longest-serving soap opera actors in the United States. She was the mother of three children, the eldest being actor Corbin Bernsen.