More than four years since his last appearance at the Khmer Rouge Tribunal, Kaing Guek Eav, the prison chief of Phnom Penh’s notorious S-21 internment camp, returned to the stand on Tuesday. He took the opportunity to allege that the previous attempts of regime number two Nuon Chea to distance himself from the crimes of the Khmer Rouge regime were “meaningless.” Duch, who oversaw the deaths of more than 15,000 people at the prison, was the first Khmer Rouge official to be found guilty of crimes committed under the Pol Pot regime, when an estimated 1.7 million Cambodians died.