Biography

Mariclare Catherine Costello (February 3, 1936 – April 17, 2026) was an American actress. She was a lifetime member of The Actors Studio. Costello's most notable role was that of Rosemary Hunter Fordwick on the television series The Waltons, from 1972 to 1977. In 1977, after her role on The Waltons, she played matriarch Maggie Fitzpatrick on the short-lived drama show The Fitzpatricks.

Known For

Indecent Proposal

David's Mother

Ordinary People

Audrey

The Adventures of Buckaroo Banzai Across the 8th Dimension

Senator Cunningham

Nightmares

Adele Cooney (segment "The Bishop of Battle")

American Harvest

Mary Alice Duncan

Raid on Entebbe

Gabrielle Krieger

The Execution of Private Slovik

Antoinette Slovik

Let's Scare Jessica to Death

Emily