The star, most famous for her role in U.K. TV series Howards' Way, died at actors' residential home Denville Hall in London on Tuesday (15Nov11) after a battle with bronchial pneumonia.
Gray started her career in 1940s melodramas for Britain's Gainsborough Pictures studio and often appeared alongside her husband, Michael Denison, on TV and in theatre productions.
The couple even made their Broadway debut together playing Lady Markby and the Earl of Caversham in Oscar Wilde's An Ideal Husband in 1996.
However, Gray will be best remembered in Britain for her turn as Kate Harvey in BBC series Howards' Way between 1985 and 1990.
She returned to the stage after her husband's death in 1998 to appear in adaptations of The Ladykillers and The Lady Vanishes.
Her last TV appearance was in 2000 on British soap opera Doctors.
Gray also had a second career as an author, writing 24 books.