
Mariclare Costello
Acting
Born 1936-02-06 · Peoria, Illinois, USA · Died 2026-04-17
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.
Acting

Shadow of the Blair Witch
Kathy Patterson

Chicago Hope
Mother Mary Catherine

Indecent Proposal
David's Mother

She Said No
Susan Finn

Appearances
Rose

American Harvest
Mary Alice Duncan

Heart of a Champion: The Ray Mancini Story
Ellen Mancini

Victims for Victims: The Theresa Saldana Story
Jane Bladow

Murder, She Wrote
Cassie Latham Burns

The Adventures of Buckaroo Banzai Across the 8th Dimension
Senator Cunningham

Nightmares
Adele Cooney (segment "The Bishop of Battle")

Skeezer
Barbara Thompson

Coward of the County
Emma Spencer

Ordinary People
Audrey

All God's Children
Winnie Naponic

The Boy Who Drank Too Much
Louise Carpenter

Hart to Hart
Anita Boyer

The Incredible Hulk
Kay Wallace

Lou Grant
Louise Larsen

The Fitzpatricks
Maggie Fitzpatrick

A Sensitive, Passionate Man
Pat Morris

Raid on Entebbe
Gabrielle Krieger

Territorial Men
Julia Baker

Conspiracy of Terror
Mrs. Warnall

After the Fall
Louise

The Gun
Beryl Strauss

The Execution of Private Slovik
Antoinette Slovik

Kojak
Diane Gordon

Going Where I've Never Been: The Photography of Diane Arbus
Herself - Narrator

The Waltons
Mrs. Rosemary Fordwick