That assassination – which scarred the American psyche for a generation – spawned dozens of overlapping conspiracy theories.

Many found it difficult to believe that a lone assassin, working unaided, could make the one-in-a million shot from the sixth-floor window of the Texas Book Depository that fatally wounded the 46-year-old president.

But if there was a conspiracy, what was the motive? Some have pointed to the significant overlap between the womanising president’s social circle and organised crime figures. Others have blamed his policies on Cuba.

But the theory which neatly ties together JFK’s two most lasting legacies is the allegation by some UFO researchers that he was about to lift the lid off America’s secret research into UFOs.

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