Agnes Robertson Moorehead (December 6, 1900 – April 30, 1974) was an American actress. In a career spanning five decades, her credits included work in radio, stage, film, and television. Moorehead was the recipient of such accolades as a Primetime Emmy Award and two Golden Globe Awards, in addition to nominations for four Academy Awards. Moorehead had joined Orson Welles' Mercury Players, as one of his principal performers in 1937. She performed in his The Mercury Theatre on the Air radio adaptations, and had a regular role opposite Welles in the serial The Shadow as Margo Lane. In 1939, Welles moved the Mercury Theatre to Hollywood, where he started working for RKO Pictures. Several of his radio performers joined him, and Moorehead made her film debut as the mother of his own character, Charles Foster Kane, in Citizen Kane (1941), considered by most film critics as one of the best films ever made.