Lee Harvey Oswald was the man accused of firing the shots that killed President John F. Kennedy.

Direct answer

Out of the names you listed — Jack Ruby, Lee Harvey Oswald, Lyndon Johnson, and Fidel Castro — the person formally accused of firing the shots that killed President Kennedy was Lee Harvey Oswald.

Quick context

  • Oswald was a former U.S. Marine who was arrested in Dallas on November 22, 1963 and charged with the murder of President Kennedy.
  • He was alleged to have fired three shots from the sixth floor of the Texas School Book Depository, fatally wounding Kennedy.
  • Two days later, Oswald himself was shot and killed by Jack Ruby while in police custody, so he never stood trial.

What about the other names?

  • Jack Ruby : He did not shoot Kennedy; he shot and killed Lee Harvey Oswald on November 24, 1963, in the basement of the Dallas police headquarters.
  • Lyndon Johnson : He was Kennedy’s vice president and became president after the assassination; he was never officially accused of firing any shots.
  • Fidel Castro : The Cuban leader was the subject of many conspiracy theories, but no formal charge was brought against him in the killing of Kennedy.

Why Oswald is named as the accused shooter

  • Official investigations, including the Warren Commission and later the House Select Committee on Assassinations, identified Oswald as the man who fired the shots that killed Kennedy, even while debating whether others might have been involved.
  • Because Oswald was killed by Ruby before trial, his legal status remained that of the accused assassin, not a convicted one.

TL;DR: The person accused of firing the shots that killed President Kennedy was Lee Harvey Oswald, not Jack Ruby, Lyndon Johnson, or Fidel Castro.