Godspeed Mariclare Costello

Mariclare Costello, best known for playing teacher Rosemary Hunter on the hit TV series The Waltons, died on April 17, 2026 at the age of 90.Mariclare Costello was born on February 3, 1936, in Peoria, Illinois. Her father, Dallas, worked as a civil engineer for the Illinois Department of Transportation and her mother, Margaret, was a secretary to the Illinois Speaker of the House. Mariclare Costello went to St. Mark School and the Academy of Our Lady in Peoria. She then attended Clarke College in Dubuque, Iowa. During her junior year, she spent time at the University of Vienna. She received a Master's degree in Theatre and Education from Catholic University in Washington.She was one of the 30 actors selected from literally hundreds to be chosen for the original Lincoln Center Repertory Company. In 1964 she made her Broadway debut, originated the role of Louise in the Arthur Miller play After the Fall. In the Sixties, she appeared on Broadway in But for Whom Charlie, The Changeling,…