Who killed John F Kennedy?

The HSCA concluded that Oswald was the assassin and were about to conclude that he acted alone when a dictabelt recording – purportedly recorded during the assassination – then surfaced. Based on over 20 witnesses who heard shots from in front of Kennedy and scientific analysis of the recording by a group of scientists, the committee concluded that there was a fourth shot and hence a second gunman, and that Kennedy was probably killed as a result of a conspiracy. Researchers – who for years had called into question the Warren Commission's finding that a lone gunmen was responsible for the assassination, and had posited a conspiracy theory – felt vindicated by the House report.