Khmer Rouge war crimes

Kaing Guek Eav oversaw Phnom Penh's notorious S-21 prison, where thousands of people were executed and tortured during the Khmer Rouge's terrifying rule in the 1970s.

He was seen as a chief architect of the regime's brutal collectivist policies that led to the deaths of some 1.7 million people. He was found guilty of war crimes by a U.N.-backed tribunal last year.

Nuon Chea, 92, who was the No. 2 leader of the Khmer Rouge from 1975-1979 and Khieu Samphan, the 87-year-old former head of state of the brutal regime, were found guilty of genocide and other crimes.