Mariclare Costello, ‘The Waltons’ Actress, Dies At 90

Mariclare Costello, best known to many television viewers for her role on The Waltons, died on April 17 at the age of 90. Her passing marks the end of a long and meaningful career that spanned stage, film, television, and teaching.

While audiences remember her performances, those closest to her recall something even deeper. She left behind a reputation for kindness, curiosity, and a rare ability to bring out the best in others, both on and off the stage.

A Career Built on Passion for the Arts

Mariclare Costello began her journey in theater, becoming one of the original members of the Lincoln Center Repertory Company in the 1960s. From there, she built a strong presence in New York’s theater scene, appearing on Broadway and working with some of the most respected names in the industry.

The Waltons joined the Bunkers in setting unbeatable precedents at the Emmys — The Waltons joined the Bunkers in setting unbeatable precedents. (Emmys / TV Guide / © CBS / Courtesy Everett Collection)

According to Entertainment Weekly, she also appeared in films and numerous television series over the years. Her recurring role as Rosemary Hunter on The Waltons introduced her to a wider audience, while guest appearances on shows like Little House on the Prairie and Murder, She Wrote showcased her versatility. Throughout her career, she balanced screen work with a deep commitment to theater.

A Life Dedicated to Teaching and Creativity

THE WALTONS, Michael Learned, Richard Thomas, Ralph Waite, Jon Walmsley, Ellen Corby, Will Geer, Kami Cotler, David W. Harper, Judy Norton-Taylor, Eric Scott, Mary Beth McDonough, 1972-81/Everett Collection

Beyond acting, Costello devoted much of her later life to teaching and mentoring young performers. She led drama programs, directed school productions, and worked with community organizations, helping others discover their creative voices. Her family described her as someone who made every space feel more alive. She encouraged others to focus on their work rather than their fears.

Mariclare Costello’s impact extended far beyond her roles. She shaped lives through her teaching, her curiosity, and her generosity. Even after stepping away from the spotlight, she remained deeply connected to the world of storytelling. Ultimately, her legacy reflects a life spent nurturing creativity and connection. Through her work and her influence, she leaves behind a lasting imprint on both the arts and the many people she inspired.