FILE - This April 15, 1993 file photo shows the body of Southern Ohio Correctional Facility guard Robert Vallandingham carried from the prison in Lucasville, Ohio, after his body was found in the prison yard. In the 20 years since the nation's longest deadly prison riot broke out in Lucasville, no interviews have been granted with the five men sentenced to death in the killing of a guard. Yet time has brought new evidence and insights that will dominate events marking the 20th anniversary of the 11-day siege of April 1993. (AP Photo/Mark Duncan, File)