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Acting
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.
Shadow of the Blair Witch
as Kathy Patterson
Chicago Hope
as Mother Mary Catherine
Indecent Proposal
as David's Mother
She Said No
as Susan Finn
Appearances
as Rose
American Harvest
as Mary Alice Duncan
Heart of a Champion: The Ray Mancini Story
as Ellen Mancini
Victims for Victims: The Theresa Saldana Story
as Jane Bladow
Murder, She Wrote
as Cassie Latham Burns
The Adventures of Buckaroo Banzai Across the 8th Dimension
as Senator Cunningham
Nightmares
as Adele Cooney (segment "The Bishop of Battle")
Skeezer
as Barbara Thompson
Coward of the County
as Emma Spencer
Ordinary People
as Audrey
All God's Children
as Winnie Naponic
The Boy Who Drank Too Much
as Louise Carpenter
Hart to Hart
as Anita Boyer
The Incredible Hulk
as Kay Wallace
Lou Grant
as Louise Larsen
The Fitzpatricks
as Maggie Fitzpatrick
A Sensitive, Passionate Man
as Pat Morris
Raid on Entebbe
as Gabrielle Krieger
Territorial Men
as Julia Baker
Conspiracy of Terror
as Mrs. Warnall
After the Fall
as Louise
The Gun
as Beryl Strauss
The Execution of Private Slovik
as Antoinette Slovik
Kojak
as Diane Gordon
Going Where I've Never Been: The Photography of Diane Arbus
as Herself - Narrator
The Waltons
as Mrs. Rosemary Fordwick
Let's Scare Jessica to Death
as Emily
Pound
as Honky Killer's Wife
