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Posed portrait American politician and US Attorney General Robert F. Kennedy (1925 - 1968), 1963. (Photo by PhotoQuest/Getty Images)

Posed portrait American politician and US Attorney General Robert F. Kennedy (1925 - 1968), 1963. (Photo by PhotoQuest/Getty Images)

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US President John F. Kennedy (1917 - 1963) (right) meets with FBI Director J. Edgar Hoover (1895 - 1972) (center), while his brother, Attorney General Robert F. Kennedy (1925 - 1968). stands with them in the White House, Washington DC, February 23, 1961. (Photo by Abbie Rowe/PhotoQuest/Getty Images)

US President John F. Kennedy (1917 - 1963) (right) meets with FBI Director J. Edgar Hoover (1895 - 1972) (center), while his brother, Attorney General Robert F. Kennedy (1925 - 1968). stands with them in the White House, Washington DC, February 23, 1961. (Photo by Abbie Rowe/PhotoQuest/Getty Images)

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Senator for New York and attorney-general, Robert Kennedy (1925 - 1968). (Photo by Hulton Archive/Getty Images)

Senator for New York and attorney-general, Robert Kennedy (1925 - 1968).    (Photo by Hulton Archive/Getty Images)

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United States Senator for New York, Robert F. Kennedy (1925-1968) pictured in his office surrounded by photographs of the Kennedy family circa 1965. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

United States Senator for New York, Robert F. Kennedy (1925-1968) pictured in his office surrounded by photographs of the Kennedy family circa 1965. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

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Ethel Skakel Kennedy, wife of assassinated Senator Robert F. Kennedy, and one of her sons follow Kennedy's coffin at his funeral in Washington DC, 8th June 1968. Among the pallbearers are Secretary of Defence, Robert McNamara (left, in glasses) and, behind him, former astronaut John Glenn. (Photo by Chris Smith/Popperfoto via Getty Images/Getty Images)

Ethel Skakel Kennedy, wife of assassinated Senator Robert F. Kennedy, and one of her sons follow Kennedy's coffin at his funeral in Washington DC, 8th June 1968. Among the pallbearers are Secretary of Defence, Robert McNamara (left, in glasses) and, behind him, former astronaut John Glenn. (Photo by Chris Smith/Popperfoto via Getty Images/Getty Images)