"Goodbye Kathryn; our beloved Mrs. Landingham," Rob Lowe, who knew Joosten from "The West Wing," wrote on Twitter. "You will never truly be gone, film is forever."

Added Felicity Huffman, who played Lynette Scavo on "Desperate Housewives," "Rest in peace, she was an amazing woman and a wonderful actress."

Joosten is survived by her two sons, Jonathan and Timothy, and two grandsons.