John Callahan (outlaw) outlaws of the "Public Enemy"-era such as Edward J. Adams and Pretty Boy Floyd. Floyd may have, in fact, gotten his start in the underworld by transporting bootleg liquor for Callahan before becoming a bank robber. Callahan was eventually convicted of drug smuggling and was sentenced to 25 years imprisonment. He would serve only seven years before his release and retired to Wichita where he died in his sleep on June 8, 1936, at age 70. John Callahan (outlaw) John Callahan (1866 – June 8, 1936) was an American outlaw and bank robber during the closing days of the Old
Pretty Boy Floyd of four law enforcement officers. Though J. Edgar Hoover used the incident as ammunition to further empower the FBI to pursue Floyd, historians are divided as to whether or not he was involved. Another more likely suspect was gang member Sol Weismann, who resembled Floyd. Floyd adamantly denied his involvement in this fiasco (apparently a botched attempt to free bank robber Frank Nash, who was in police custody). The gunfight was an attack by Vernon Miller and accomplices on lawmen escorting robber Frank "Jelly" Nash to a car parked at the Union Station in Kansas City, Missouri. Two Kansas City,