In March 1963, Lee Harvey Oswald, alias "A. Hidell", purchased a 6.5 mm caliber Carcano rifle by mail order. He also purchased a revolver by the same method. It is officially accepted that this was the rifle that was used in the Texas School Book Depository to assassinate President Kennedy. A palmprint found upon examination of the rifle, and detective work tracing its sale, both eventually led to Oswald.