Acting · Peoria, Illinois, USA · Born February 6, 1936
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.
MovieShadow of the Blair Witch
2000
as Kathy Patterson
TVChicago Hope
1994
as Mother Mary Catherine
MovieIndecent Proposal
1993
as David's Mother
MovieShe Said No
1990
as Susan Finn
MovieAppearances
1990
as Rose
MovieAmerican Harvest
1987
as Mary Alice Duncan
MovieHeart of a Champion: The Ray Mancini Story
1985
as Ellen Mancini
MovieVictims for Victims: The Theresa Saldana Story
1984
as Jane Bladow
TVMurder, She Wrote
1984
as Cassie Latham Burns
MovieThe Adventures of Buckaroo Banzai Across the 8th Dimension
1984
as Senator Cunningham
MovieNightmares
1983
as Adele Cooney (segment "The Bishop of Battle")
MovieSkeezer
1982
as Barbara Thompson
MovieCoward of the County
1981
as Emma Spencer
MovieOrdinary People
1980
as Audrey
MovieAll God's Children
1980
as Winnie Naponic
MovieThe Boy Who Drank Too Much
1980
as Louise Carpenter
TVHart to Hart
1979
as Anita Boyer
TVThe Incredible Hulk
1977
as Kay Wallace
TVLou Grant
1977
as Louise Larsen
TVThe Fitzpatricks
1977
as Maggie Fitzpatrick
MovieA Sensitive, Passionate Man
1977
as Pat Morris
MovieRaid on Entebbe
1976
as Gabrielle Krieger
MovieTerritorial Men
1976
as Julia Baker
MovieConspiracy of Terror
1975
as Mrs. Warnall
MovieAfter the Fall
1974
as Louise
MovieThe Gun
1974
as Beryl Strauss
MovieThe Execution of Private Slovik
1974
as Antoinette Slovik
TVKojak
1973
as Diane Gordon
MovieGoing Where I've Never Been: The Photography of Diane Arbus
1972
as Herself - Narrator
TVThe Waltons
1972
as Mrs. Rosemary Fordwick
MovieLet's Scare Jessica to Death
1971
as Emily
MoviePound
1970
as Honky Killer's Wife
