Lee Harvey Oswald (October 18, 1939 – November 24, 1963) was a U.S. Marine veteran who assassinated John F. Kennedy, the 35th president of the United States, on November 22, 1963.

Oswald was placed in juvenile detention at age twelve for truancy, during which he was assessed by a psychiatrist as "emotionally disturbed" due to a lack of normal family life. He attended twelve schools in his youth, quitting repeatedly, and at age seventeen he joined the Marines, where he was court-martialed twice and jailed. In 1959, he was discharged from active duty into the Marine Corps Reserve, then flew to Europe and defected to the Soviet Union. He lived in Minsk, married a Russian woman named Marina, and had a daughter. In June 1962, he returned to the United States with his wife, and eventually settled in Dallas, Texas, where their second daughter was born.

Oswald shot and killed Kennedy on November 22, 1963, from a sixth-floor window of the Texas School Book Depository as Kennedy traveled by motorcade through Dealey Plaza in Dallas. About 45 minutes after assassinating Kennedy, Oswald murdered Dallas police officer J. D. Tippit on a local street. He then slipped into a movie theater, where he was arrested for Tippit's murder. Oswald was charged with the assassination of Kennedy, but he denied responsibility for the killing, claiming that he was a patsy. Two days later, Oswald himself was murdered by local nightclub owner Jack Ruby on live television in the basement of Dallas Police Headquarters.

In September 1964, the Warren Commission concluded that both Oswald and Ruby had acted alone. This conclusion, though controversial, was supported by investigations from the Dallas Police Department, the Federal Bureau of Investigation (FBI), the United States Secret Service, and the House Select Committee on Assassinations (HSCA). Despite forensic, ballistic, and eyewitness accounts supporting the official findings, public opinion polls have shown that most Americans still do not believe that the official version tells the whole truth of the events, and the assassination has spawned numerous conspiracy theories.

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