A survey conducted in April shows 59 percent of Americans think that multiple people were involved in some sort of conspiracy to murder President John F. Kennedy.
One man who can shed some new light on this topic is Philip Shenon, a veteran investigative journalist and author of "A Cruel and Shocking Act: The Secret History of the Kennedy Assassination."
The author says this was meant to be an investigation into the Warren Commission but it became much more.
"I kept stumbling onto evidence that had been denied to the Warren Commission, witnesses that had been denied to the Warren Commission, and I discovered that there had been a tremendous amount of evidence that had been destroyed or disappeared over the years. And so I just kept stumbling upon stuff and it became a big book but I hope it's a pretty readable book."
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