Mariclare Costello

1936-02-06 – 2026-04-17 (age 90) Peoria, Illinois, USA

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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.

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Mariclare Costello

Known For

Indecent Proposal

Indecent Proposal

1993

as David's Mother

The Adventures of Buckaroo Banzai Across the 8th Dimension

The Adventures of Buckaroo Banzai Across the 8th Dimension

1984

as Senator Cunningham

Ordinary People

Ordinary People

1980

as Audrey

Raid on Entebbe

Raid on Entebbe

1976

as Gabrielle Krieger

Let's Scare Jessica to Death

Let's Scare Jessica to Death

1971

as Emily

Nightmares

Nightmares

1983

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

The Gun

The Gun

1974

as Beryl Strauss

The Boy Who Drank Too Much

The Boy Who Drank Too Much

1980

as Louise Carpenter

She Said No

She Said No

1990

as Susan Finn

Heart of a Champion: The Ray Mancini Story

Heart of a Champion: The Ray Mancini Story

1985

as Ellen Mancini

All God's Children

All God's Children

1980

as Winnie Naponic

American Harvest

American Harvest

1987

as Mary Alice Duncan

The Execution of Private Slovik

The Execution of Private Slovik

1974

as Antoinette Slovik

Pound

Pound

1970

as Honky Killer's Wife

After the Fall

After the Fall

1974

as Louise

Coward of the County

Coward of the County

1981

as Emma Spencer

Conspiracy of Terror

Conspiracy of Terror

1975

as Mrs. Warnall

A Sensitive, Passionate Man

A Sensitive, Passionate Man

1977

as Pat Morris

Appearances

Appearances

1990

as Rose

Shadow of the Blair Witch

Shadow of the Blair Witch

2000

as Kathy Patterson