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President of the United States, John F Kennedy (1917-1963) pictured with his wife Jacqueline Kennedy (1929-1994) seated in the rear seat of an open top limousine forming part of a presidential motorcade at Dallas Love Field airport on 22nd November 1963. Governor John Connally sits in the seat in front of the President. President Kennedy would be assassinated later the same day. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

President of the United States, John F Kennedy (1917-1963) pictured with his wife Jacqueline Kennedy (1929-1994) seated in the rear seat of an open top limousine forming part of a presidential motorcade at Dallas Love Field airport on 22nd November 1963. Governor John Connally sits in the seat in front of the President. President Kennedy would be assassinated later the same day. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

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The front page of the New York American Journal, announcing that President John Kennedy has been shot and is reportedly dead. (Photo by Three Lions/Getty Images)

The front page of the New York American Journal, announcing that President John Kennedy has been shot and is reportedly dead.   (Photo by Three Lions/Getty Images)

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Jacqueline Kennedy, Edward Kennedy and Robert Kennedy stand as the coffin of President John Fitzgerald Kennedy passes them. Original Publication: People Disc - HF0367 (Photo by Keystone/Getty Images)

Jacqueline Kennedy, Edward Kennedy and Robert Kennedy stand as the coffin of President John Fitzgerald Kennedy passes them.  Original Publication: People Disc - HF0367   (Photo by Keystone/Getty Images)

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WASHINGTON DC, UNITED STATES - NOVEMBER 25: Outside Cathedral St Matthew John John Kennedy salutes his father's coffin with members of the Kennedy family (L-R) From left: Senator Edward Kennedy, Caroline Kennedy, Jackie Kennedy, Attorney General Robert Kennedy and John Kennedy during the funeral on November 25, 1963 in Washington DC, United States. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

WASHINGTON DC, UNITED STATES - NOVEMBER 25:  Outside Cathedral St Matthew John John Kennedy salutes his father's coffin with members of the Kennedy family (L-R)  From left: Senator Edward Kennedy, Caroline Kennedy, Jackie Kennedy, Attorney General Robert Kennedy and John Kennedy during the funeral on November 25, 1963 in Washington DC, United States. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

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WASHINGTON DC, UNITED STATES - NOVEMBER 25: Robert Kennedy and Edward Kennedy with their sister in law Jacqueline Kennedy during the funeral of President John F Kennedy on november 25, 1963 in Washington DC, United States. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

WASHINGTON DC, UNITED STATES - NOVEMBER 25:  Robert Kennedy and Edward Kennedy with their sister in law Jacqueline Kennedy during the funeral of President John F Kennedy on november 25, 1963 in Washington DC, United States. (Photo by Keystone-France/Gamma-Keystone via Getty Images)