Texas Governor John Connally adjusts his tie (foreground) as President and Mrs. Kennedy, in a pink outfit, settled in rear seats, prepared for motorcade into Dallas from the airport, Nov. 22, 1963. | Corbis

Who Killed JFK?: A Conspiracy Primer

From Castro to mobsters to the KGB, many theories still compete to answer one of history's biggest questions.

November 20, 2013
7:00 AM EST
Many eyewitnesses reported a fourth shot coming from somewhere in Dealey Plaza, the infamous "grassy knoll," shown here. | Wikipedia Commons
Lee Harvey Oswald with rifle and holding Marxist newspapers, taken in Oswald's back yard, Neely Street, Dallas Texas in March 1963. | Wikipedia Commons
Lee Harvey Oswald and others handing out "Fair Play for Cuba" leaflets in New Orleans on Aug. 16, 1963 | Wikimedia Commons
Jackie Kennedy leans over a dying President Kennedy as a Secret Service man climbs on back of car. | Corbis
Carlos Marcello (C), his son Joe (L) and one of Carlos' attorneys leaves federal court Oct. 7, 1966 after Carlos testified before U.S. Commissioned Fritz Windhorst on charges that he slugged an FBI Agent at New Orleans Airport. | Corbis