Sim's passing was announced on Tuesday night (19Jan16), following a performance of Agatha Christie's The Mousetrap at the Nottingham Theatre Royal in England.

The play was particularly special for the actress as she starred in the original 1952 stage production of the murder mystery classic alongside her late husband.

Sim had been living at London's Denville Hall, a retirement home for actors, since 2013, after she was diagnosed with dementia the year before.

A graduate of the Royal Academy of Dramatic Art, Sim starred in a string of successful films and stage shows throughout her career, including notable roles in A Canterbury Tale, Great Day, Pandora and the Flying Dutchman and The Night My Number Came Up.

Sim and Attenborough wed in 1945, and were together until his death in 2014, at age 90. They appeared in three films together - Dancing With Crime, The Outsider and The Magic Box.