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.
24 movies · 8 shows
Shadow of the Blair Witch
2000·5.7
Indecent Proposal
1993·6.4
She Said No
1990·7.7
Appearances
1990·10.0
American Harvest
1987·9.0
Heart of a Champion: The Ray Mancini Story
1985·6.0
Victims for Victims: The Theresa Saldana Story
1984·7.5
The Adventures of Buckaroo Banzai Across the 8th Dimension
1984·6.0
Nightmares
1983·5.7
Skeezer
1982·10.0
Coward of the County
1981·6.5
Ordinary People
1980·7.4
All God's Children
1980·6.5
The Boy Who Drank Too Much
1980·4.7
A Sensitive, Passionate Man
1977·5.5
Raid on Entebbe
1976·6.0
Territorial Men
1976·0.0
Conspiracy of Terror
1975·7.0
After the Fall
1974·8.0
The Gun
1974·8.7
The Execution of Private Slovik
1974·7.4
Going Where I've Never Been: The Photography of Diane Arbus
1972·6.0
Let's Scare Jessica to Death
1971·6.2
Pound
1970·4.8