Nuon Chea
In 1985 he officially succeeded Pol Pot as leader of the Khmer Rouge, and served in this position until 1998. In December 1998 Khieu and former Pol Pot's deputy Nuon Chea surrendered to the Royal Cambodian Government. Prime Minister Hun Sen, however, defied international pressure and Khieu Samphan was not arrested or prosecuted at the time of his surrender.