Ieng Sary sits next to his wife during his defection ceremony, Pailin, Cambodia, November, 1996. (Youk Chhang/Documentation Center of Cambodia Archive)

Ieng Sary (fourth from left) poses with other Khmer Rouge members in Malai, a small town near Thai border, March 1988. (Documentation Center of Cambodia Archive)

Ieng Sary claps his hands while inspecting the railroad in Takeo province with Deputy Prime Minister in charge of Economics Affairs Vorn Vet and Chinese experts, 1977. (Documentation Center of Cambodia Archive)

Ieng Sary on a 1977 railroad inspection tour with Chinese advisers. (Documentation Center of Cambodia Archive)

This undated photo shows Ieng Sary with Norodom Sihanouk in Phnom Penh, Cambodia. (Documentation Center of Cambodia Archive)