“Laverne & Shirley,” a spinoff of “Happy Days,” starred Williams and Marshall as roommates who work in a Milwaukee bottling plant. Williams’ character was the more straitlaced of the pair.
Marshall died in 2018 at 75.
Williams also appeared in the 1973 film “American Graffiti” and the 1974 film “The Conversation.”
“Laverne & Shirley,” like “Happy Days,” was created by Garry Marshall, Penny Marshall’s brother. Penny Marshall landed her breakthrough role in the mid-’70s with his help.
The show was among the most popular on television in its prime. Garry Marshall died in 2016.
Henry Winkler, who played The Fonz in “Happy Days,” was among those mourning Williams.
“Cindy has been my friend and professional colleague since I met her on the set of ‘Happy Days’ in 1975. Not once have I ever been in her presence when she wasn’t gracious, thoughtful and kind,” Winkler said.
“Cindy’s talent was limitless. There was not a genre she could not conquer. I am so glad I knew her,” he said.
Williams was born in Van Nuys in Los Angeles’ San Fernando Valley.
She had two children, Emily and Zak. They said that their mother was devoted to rescuing animals and her faith, and that she wanted the world to laugh.
“May that laughter continue in everyone, because she would want that,” they said in the statement. “Thank you for loving our Mom, she loved you too.”
The Associated Press contributed.