On November 24, Ruby drove into town with one of his pet dogs and sent an emergency money order at the Western Union on Main Street to one of his employees. The time stamp of completion for the cash transaction on the money order was 11:17 A. M. Ruby then walked one half block to the nearby Dallas police headquarters, where he made his way into the basement via either the Main Street ramp or a stairway accessible from an alleyway next to the Dallas Municipal Building. At 11:21 am CST — while authorities were escorting Oswald through the police basement to an armored car that was to take him to the nearby county jail — Ruby stepped out from a crowd of reporters and fired a single round from his . 38 revolver into Oswald's abdomen, fatally wounding him. Ruby was immediately subdued by agents and police. The shooting was broadcast live nationally, and millions of television viewers witnessed it. Oswald was taken by ambulance while unconscious to Parkland Memorial Hospital—the same hospital where doctors tried to save President Kennedy's life two days earlier. Oswald died at 1:07 p. m.
In September 1964 the Warren Commission concluded that Ruby acted alone in killing Oswald.  Various groups believed Ruby was involved with major figures in organized crime and that he killed Oswald as part of an overall plot surrounding the assassination of Kennedy .