On the 22 November 1963, President John F Kennedy was assassinated in Dallas. Lee Harvey Oswald was arrested and charged with the murder, but over the past 60 years millions of people have come to believe that Oswald was just a small cog in a wider plot to murder the president, orchestrated by a powerful group such as the CIA, the Mafia or the Cuban regime. In this new episode of Conspiracy, Rob Attar speaks to the journalist Gerald Posner whose landmark 1993 book Case Closed famously concluded that Oswald had indeed acted alone. Together they dissect the evidence from the assassination and consider why conspiracy theories about it have become so widespread.

The HistoryExtra podcast is produced by the team behind BBC History Magazine.
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