Modern forensic science re-examines the evidence. * What did forensics learn decades later that wasn't clear in 1963? * What mistakes did the original crime investigators make that contributed to to the belief that the assassination was a conspiracy? As critics universally noted at the time, this documentary is the most definitive and responsible investigation of the tragedy. Nothing has been released since its original telecast that changes that conclusion. Unprecedented footage of the Dallas physicians who tried to save the President's life, as they examine new evidence especially for this documentary; computerized 3-D Dealey Plaza replica; frame by frame Zapruder footage comparisons; photo analysis by experts; leading critics of the Warren Commission's lone gunman conclusion.