A former Secret Service agent who was present at President John F. Kennedy's assassination has come forward with a new claim that would debunk the 'magic bullet' theory and raises questions about whether there was a second shooter.

Paul Landis, 88, broke his silence on Saturday, nearly 60 years after Kennedy was shot dead in a motorcade passing through Dallas, to share his bombshell recollection with the New York Times. 

Landis, who in 1963 was a young Secret Service agent assigned to protect First Lady Jaqueline Kennedy, said that in the chaos following the shooting, he picked up a nearly pristine bullet sitting on the top of the back seat of the open limousine.