John F. Kennedy was assassinated on November 22, 1963, while riding in a presidential motorcade in Dallas, Texas. The official conclusion by the Warren Commission after a 10-month investigation was that Lee Harvey Oswald, a former U.S. Marine, assassinated Kennedy by shooting him from the Texas School Book Depository. Oswald acted alone, and there was no conclusive evidence that he or anyone else was part of a conspiracy. Oswald was killed two days later by Jack Ruby, a nightclub owner, before he could stand trial. Kennedy was in Texas to campaign and promote unity within the Democratic Party ahead of the 1964 presidential election. The assassination remains significant as it abruptly ended the presidency of a popular leader and was a shocking event witnessed live on television. While the official report states Oswald acted alone, there has been widespread speculation and various conspiracy theories alleging other possible perpetrators or motives. However, no definitive conspiracy has been proven to date.