Lee Harvey Oswald

Lee Harvey Oswald (1939–1963) was, according to two United States government investigations, the assassin of U.S. President John F. Kennedy on November 22, 1963. A former United States Marine who defected to the Soviet Union and later returned, Oswald was arrested on suspicion of killing Dallas police officer J.D. Tippit and later connected to the assassination of President Kennedy. Oswald denied any responsibility for the murders. Two days later, while being transferred under police custody from the city jail to the county jail, Oswald was shot and mortally wounded by Jack Ruby on live television.

Lee Harvey Oswald in "Before the Beginning"
The time-viewer techonology showed that Lee Harvey Oswald had indeed worked alone, and was not part of a larger conspiracy to assassinate President John F. Kennedy.