According to a statement from Cooper's son, actor Corbin Bernsen, Cooper died early Wednesday. According to Bernsen, she died peacefully in her sleep, with her daughter, Caren, by her side.
Bernsen's Facebook post:
Cooper began her acting career in the early 50s in movies such as The Redhead From Wyoming and The Man From the Alamo. She went on to have roles in many network TV shows, including Perry Mason, Hawaii Five-O, and Mannix.
In 1973 Cooper was cast in the role of Katherine Chancellor in the long-running U.S. soap opera The Young and the Restless. The character has been described as the "matriarch" of soap opera television and her rivalry with Jill Foster Abbott has produced story twists for The Young and the Restless for many years.