Seymour Platt, who lives in Stonepark, spoke of his loss in the wake of his mother's passing on Monday at the Princess Royal university hospital in Farnborough.
Ms Keeler was at the centre of the 1963 political scandal, which enthralled and scandalised the nation, after having an affair with then-Secretary of State for War John Profumo.
Keeler and Profumo's brief affair, which lasted a few weeks, was so controversial because she become involved with a Russian commander at the same time.
When it emerged that Keeler had also slept with a Soviet naval attache with ties to Russian intelligence, the collision of sex, wealth and national security issues caused a sensation and helped topple the Conservative government.
He told the Guardian: 'There was a lot of good around Chris's rather tragic life, because there was a family around her that loved her.
"I don't think she ever got away from it - that was a tragedy". She spent the rest of her life trying to escape her unwanted notoriety.
She said: 'I know the truth and it is far more shocking than what the public has been fed by the British Establishment.
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'Far better that the Establishment be caught with its trousers down than involved in stealing secrets.
The consequences for the Tory party were catastrophic and Macmillan's Cabinet was shaken by the revelations.
Ward was put on trial and took a fatal overdose the night before he was convicted of living off immoral earnings.
Other members of the Establishment were also implicated in the fallout of the scandal.
"She believed absolutely everything she ever said about the Profumo affair", he told the Press Association.
Mr Thompson, who updated the book, published as Secrets And Lies in 2012, following the death of John Profumo, described Ms Keeler as a "victim of the time", adding that she would probably have had her own TV show had the scandal happened today.
A major new BBC series revisiting the scandal is due to start filming next year.