(CNN) -- Jeanne Cooper, who played Katherine Chancellor, the "Dame of Genoa City," on "The Young and the Restless," has died. She was 84. 

Her death was confirmed by her son, actor Corbin Bernsen, on his Twitter account. 

"Mom passed this morning," Bernsen posted. "She was in peace and without fear." 

Cooper had been suffering from an undisclosed illness. The cause of death was not given. 

Cooper was already a well-established TV actress when she took the role of Chancellor in 1973. "The Young and the Restless" was struggling in the ratings and its creator, William J. Bell, wanted to spice things up. 

"Jeanne was the matriarch of the show in every sense of the word," said Lauralee Bell, Christine/Cricket on "The Young and the Restless" and William Bell's daughter. 

"When you did work you were proud of, you'd hope for approval or a 'good job' from Jeanne as a child would from a parent. When things got too tense, she'd break the tension with her amazing wit. She would teach the younger actors without ever talking down to them. In fact, she would raise them up," said Bell. "She always had my back and my parents (and our whole family) always had hers." 

Kate Linder, another member of "The Young and the Restless" cast, said Cooper was her "mentor and an amazing actress and friend." Linder, Esther Valentine on the show, said, "When Jeanne welcomed you into her life, you knew it and it was a fantastic feeling. This is truly the end of an era, not just for fans of 'The Young and the Restless' but for all of the people she touched throughout her long and distinguished career and life." 
Who is Corbin Bernson?
What did he tweet?
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Was she famous?
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When did she first get the role?
Was the show doing well at that time?
what show?
Who considered her their mentor?
who was she?
Who played Christine on the show?
who was her dad?
and he was?
of what?
what did he want to do when he hired her?
Was Jeanne cooper in her 90s when she died?
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actor
actor Corbin Bernsen
"Mom passed this morning,"
"Mom passed this morning," Bernsen posted
Jeanne Cooper
 Jeanne Cooper, 
yes
Jeanne Cooper, who played Katherine Chancellor, the "Dame of Genoa City," on "The Young and the Restless,"
actress
played Katherine Chancellor, the "Dame of Genoa City," on "The Young and the Restless
Young and the Restless
"Dame of Genoa City," on "The Young and the Restless," has died. She was 84. 
Katherine Chancellor
Jeanne Cooper, who played Katherine Chancellor
Dame of Genoa City
the "Dame of Genoa City," on "The Young and the Restless,
1973
Cooper was already a well-established TV actress when she took the role of Chancellor in 1973
no
Young and the Restless" was struggling in the ratings
The Young and the Restless
"The Young and the Restless" was struggling in the ratings
Kate Linder
Kate Linder, another member of "The Young and the Restless" cast, said Cooper was her "mentor and an amazing actress and friend.
member of "The Young and the Restless" cast
member of "The Young and the Restless" cast,
Lauralee Bell
 Lauralee Bell, Christine/Cricket on "The Young and the Restless" and William Bell's daughter. 

William Bell
Christine/Cricket on "The Young and the Restless" and William Bell's daughter. 

creator
creator, William J. Bell
The Young and the Restless
 "The Young and the Restless" was struggling in the ratings and its creator, William J. Bell, 
spice things up.
William J. Bell, wanted to spice things up. 
no
Jeanne Cooper, who played Katherine Chancellor, the "Dame of Genoa City," on "The Young and the Restless," has died. She was 84.
84
She was 84. 
