Marilyn Knowlden, the wildly popular child actress of the 1930s and ’40s who worked alongside icons like Katharine Hepburn, has died.

Knowlden passed away peacefully on Monday at 99, due to natural causes, at an assisted living facility in Eagle, Idaho. Her son, Kevin Goates, confirmed her death to The Hollywood Reporter.

During her Hollywood career from 1931 to 1944, which included over three dozen films, Knowlden worked alongside Claudette Colbert, Hepburn, Irene Dunne, and Norma Shearer, portraying their onscreen mothers in Imitation of Life (1934), A Woman Rebels (1936), Show Boat (1936), and Marie Antoinette (1938), respectively.

According to THR, Knowlden also played a younger Ann Sheridan in Michael Curtiz’s Angels With Dirty Faces (1938), which starred James Cagney and Humphrey

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