Jeanne Cooper, the actress best known for her enduring role on the daytime soap The Young and the Restless, has died, her son confirmed on Facebook Wednesday afternoon. She was 84.

"My mother passed away this morning just a short time ago, peaceful with my sister by her side, in her sleep," Corbin Bernsen wrote in the post. "I was going to visit this afternoon, thought I had time. Reminder to self - time is a precious thing," Bernsen continued.

Cooper, who has played matriarch Katherine Chancellor on the CBS soap since 1973, joined the cast of The Young and the Restless just months after the show had started. "She has been a blaze her entire life, that beacon, that boxer I spoke of earlier," her son shared. "She went the full twelve rounds and by unanimous decision... won!"

CBS' Young and the Restless celebrated its 40th anniversary in March. During Cooper's tenure on the show, she earned 11 Daytime Emmy nominations and received an award for best actress in a drama series in 2008.

She is survived by three children, Corbin, Collin and Caren, all of whom are actors.