Since Oswald was killed so soon after murdering Kennedy, his motive for the crime remained unknown. On November 29, 1963, Johnson established the President’s Commission on the Assassination of President Kennedy in order to investigate his predecessor’s death. The commission was led by Chief Justice Warren, a former governor of California who was appointed to the Supreme Court in 1953. The commission also included two U.S. senators, two U.S. representatives, a former CIA director and a former World Bank president.
During its almost yearlong investigation, the Warren Commission, as it was commonly known, reviewed reports by the FBI, Secret Service, Department of State and the attorney general of Texas, and also pored over Oswald’s personal history, political affiliations and military record. The group listened to the testimony of hundreds of witnesses and traveled to Dallas several times to visit the site where Kennedy was shot.
In its 888-page report presented to Johnson on September 24, 1964 (and released to the public three days later), the commission concluded that the bullets that killed Kennedy and injured Connally were fired by Oswald in three shots from a rifle pointed out of a sixth-floor window in the Texas School Book Depository. Oswald’s life, including a visit he made to the Soviet Union, was described in detail, but the report made no attempt to analyze his motives. Additionally, the commission found that the Secret Service had made poor preparations for Kennedy’s visit to Dallas and had failed to sufficiently protect him, and concluded that Ruby had acted alone in killing Oswald.