Helmond died Saturday of complications from Alzheimer's in her Los Angeles residence, according to Manfred Westphal, chief marketing and communications officer for APA.
Throughout her four-season run on the show, Helmond earned four Primetime Emmy nominations and, in 1981, won the Golden Globe for Best Actress in a Television Series (Comedy or Musical).
Helmond is survived by her husband, David Christian, Variety reported. She had longtime recurring roles on Coach and Everybody Loves Raymond, as well as guest spots on The Glades and True Blood.
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Her co-star, Alyssa Milano, shared photos of Helmond in a heartfelt social media tribute.
The seven-time Emmy Award nominee also appeared in several films and secured a Tony Award nomination for Eugene O'Neill's play The Great God Brown. Helmond played the feisty mother to Judith Light's Angela, Mona Robinson. We offer our condolences to her friends and family in their time of grief. She had no children. Clearly, the last years of Helmond's life was spent trying to manage her Alzheimer's diagnosis - a struggle that has now come to its end.
Born Katherine Marie Helmond in Galveston, Texas, on July 5, 1929, she was the oldest of three daughters.