But on April 12 Bernsen tweeted that his mother faced an "uphill battle" for an undisclosed illness. In subsequent days he wrote of her gradual improvement and said that she'd been taken off breathing equipment.
In a Facebook posting April 17, Bernsen said his mother cursed several times, "showing me that she's becoming her old self, not thrilled about the situation, and ready to get out of the hospital and shake up the world."
On Wednesday he wrote that she remained a fighter until the end: "She has been a blaze her entire life, that beacon, that boxer I spoke of earlier. She went the full twelve rounds and by unanimous decision... won!"
Cooper, born in the California town of Taft in 1928, attended the College of the Pacific and performed in local theater productions before her professional career began with the 1953 film "The Redhead from Wyoming" starring Maureen O'Hara. Other film credits include 1968's "The Boston Strangler" with Tony Curtis and 1967's "Tony Rome" with Frank Sinatra.
She had a parallel career in TV, with shows including "The Adventures of Kit Carson" in 1953 and "The Pepsi-Cola Playhouse" in 1954 and "Bracken's World" in 1969-70.
In a recurring role on "L.A. Law," she played the mother to Bernsen's character, Arnie, and received a 1987 Emmy nomination for best guest actress in a drama. Bernsen later joined his mother on her series, making several appearances as a priest, Father Todd.
But it was her role on "The Young and the Restless" that made her a TV star intimately familiar to viewers.
In 1984, Cooper's real-life facelift was televised on the show as her character underwent the surgery at the same time, and had no regrets about it.