The actress was best known for a run on the Ellen DeGeneres comedy Ellen.
Kate Williamson’s death comes in less than one month after the death of her husband, actor Al Ruscio, who died at the age of 89 on November12.
The actress died surrounded by her four children at her Encino, California, home.
Kate Williamson’s decades-long acting career included the 1994 Barry Levinson film Disclosure, the 2002 film Dahmer and the 1993 James Spader film Dream Lover.
She married Al Ruscio in 1954, and had four children together — actress and poet Elizabeth Ruscio, director and editor Michael Ruscio, production designer Nina Ruscio and teacher Maria Ruscio.
Kate Williamson is survived by her children and five grandchildren.
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