About
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
Murder, She WroteSeries • 1984
Chicago HopeSeries • 1994
The WaltonsSeries • 1972
Hart to HartSeries • 1979
The Incredible HulkSeries • 1977
Lou GrantSeries • 1977
KojakSeries • 1973
Indecent ProposalMovie • 1993
Ordinary PeopleMovie • 1980
The Adventures of Buckaroo Banzai Across the 8th DimensionMovie • 1984
NightmaresMovie • 1983
Raid on EntebbeMovie • 1976
Let's Scare Jessica to DeathMovie • 1971
Shadow of the Blair WitchMovie • 2000