Investigative journalist Anthony Summers, interviews a Cuban exile who claims a second gunman may have been involved in the assassination of President Kennedy.

For 50 years, since the assassination of John F Kennedy on November 22 1963, there has been a persistent belief that more than one gunman may have been at work in Dallas that day, possibly shooting at the president from the front, rather than the rear, as Lee Harvey Oswald is alleged to have done. Now, for the first time, a name has emerged for candidate of 'second trigger'.

In this exclusive video interview, aired by the Telegraph for the first time, the investigative journalist Anthony Summers, author of Not in Your Lifetime, a study of the JFK assassination, reveals that the second gunman may have been a Cuban called Herminio Diaz Garcia.

Shortly before his death, 81-year-old Reinaldo Martinez Gomez, a Cuban exile living in Florida, spoke to Summers about his friend Diaz, a Cuban anti-Castro fighter, sometime employee of the American Mafia and seasoned political assassin. He describes how Diaz admitted his "participation" in Kennedy's death to another man in 1966 while preparing for a commando-style attack on Castro that was to result in his own death.

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