The article is taken from a research journal on the assassination of President John F. Kennedy, published by the British research group Dealey Plaza. It focuses on several aspects of the assassination, including Lee Harvey Oswald's learning of Russian, the identity of the police officers who escorted the Zapruder film, and the existence of a fragment of Kennedy's skull found near the crime scene. The article also examines the role of witnesses to the assassination and the killing of police officer J.D. Tippit, particularly the possibility that Tippit was shot by a hitman rather than by Oswald.