Sheila Sim, an actress and the widow of legendary actor/director Richard Attenborough, has died. She was 93.

Her death was announced following a performance of The Mousetrap at the Theatre Royale in Nottingham, reports The Mirror. The Agatha Christie thriller was a show Sim performed in alongside Attenborough in 1952.

According to The Hollywood Reporter, Sim had been living at Denville Hall, a retirement home, in London since 2013. She was battling dementia.

Sim and Attenborough had been married since January 1945. The actor, who won an Oscar for directing Ghandhi, died in August 2014 at age 90.

Sim made her film debut in Michael Powell and Emeric Pressburger’s 1944 film A Canterbury Tale. She also appeared in Great Day and Pandora and the Flying Dutchman. She made three films with Attenborough.

Sim is survived by her son, Michael Attenborough. Her daughter and granddaughter were killed during the 2014 Indian Ocean Tsunami.