Mariclare Costello

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. In total, there are 32 recognized credits in film and television. On Cinestia you can browse Mariclare Costello's complete filmography — 24 films and 8 series — and find where to watch each title.