Mariclare Costello

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

Murder, She Wrote

Chicago Hope

The Waltons

Hart to Hart

The Incredible Hulk

Lou Grant

All Movies (24)

Shadow of the Blair Witch2000 · as Kathy Patterson
Indecent Proposal1993 · as David's Mother
She Said No1990 · as Susan Finn
Appearances1990 · as Rose
American Harvest1987 · as Mary Alice Duncan
Heart of a Champion: The Ray Mancini Story1985 · as Ellen Mancini
Victims for Victims: The Theresa Saldana Story1984 · as Jane Bladow
The Adventures of Buckaroo Banzai Across the 8th Dimension1984 · as Senator Cunningham
Nightmares1983 · as Adele Cooney (segment "The Bishop of Battle")
Skeezer1982 · as Barbara Thompson
Coward of the County1981 · as Emma Spencer
Ordinary People1980 · as Audrey
All God's Children1980 · as Winnie Naponic
The Boy Who Drank Too Much1980 · as Louise Carpenter
A Sensitive, Passionate Man1977 · as Pat Morris
Raid on Entebbe1976 · as Gabrielle Krieger
Territorial Men1976 · as Julia Baker
Conspiracy of Terror1975 · as Mrs. Warnall
After the Fall1974 · as Louise
The Gun1974 · as Beryl Strauss
The Execution of Private Slovik1974 · as Antoinette Slovik
Going Where I've Never Been: The Photography of Diane Arbus1972 · as Herself - Narrator
Let's Scare Jessica to Death1971 · as Emily
Pound1970 · as Honky Killer's Wife

All TV Shows (10)

Chicago Hope1994 · as Mother Mary Catherine
Murder, She Wrote1984 · as Cassie Latham Burns
Hart to Hart1979 · as Anita Boyer
The Incredible Hulk1977 · as Kay Wallace
Lou Grant1977 · as Louise Larsen
The Fitzpatricks1977 · as Maggie Fitzpatrick
Kojak1973 · as Diane Gordon
The Waltons1972 · as Mrs. Rosemary Fordwick
The Waltons1972 · as Miss Rosemary Hunter
The Waltons1972 · as Mrs. Rosemary Fordwick (archive footage)