The long-held conspiracy theory that John F. Kennedy was shot by a second gunman on the grassy knoll is wrong, according to a new analysis of video footage of the shooting, published in the journal Heliyon. The results support the official autopsy findings: JFK suffered a gunshot wound caused by the same type of rifle as that owned by Lee Harvey Oswald, fired from the vicinity of the Texas School Book Depository building located behind the motorcade.