The Coventry-born star, who was made a CBE in 1991, worked in close collaboration with playwright Samuel Beckett
Whitelaw died yesterday in the early hours at a nursing home in London, said her son Matthew Muller, reported BBC Online.
"I could not have asked for a more loving mum. She had an incredible career - but first and foremost she was my mum - and that's who I will miss," he said.
Whitelaw made her radio acting debut aged just 11.
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She was well known for her role as Mrs Baylock in horror film 'The Omen'.
Whitelaw also played a starring role as Violet Kray in 'The Krays' and more recently appeared in comedy 'Hot Fuzz'.
During her career, she won a British Academy Award for best newcomer for her role in 'Hell is a City'. She also won Best Supporting Actress for her parts in 'Twisted Nerve' and 'Charlie Bubbles'.