He was Pol Pot's trusted henchman, the brilliant mathematician who calmly fashioned an efficient apparatus of torture and death out of a Phnom Penh high school and who oversaw, during the Khmer Rouge's reign of terror, the interrogation and cudgelling to death of some 17,000 Cambodians.

In the West he has been called "Cambodia's Heinrich Himmler"; since Pol Pot himself and his lieutenant Ta Mok cheated justice by dying, he is the most vivid symbol of the Khmer Rouge left alive. His name is Kang Khek Ieu, but he is better known by his nom de guerre, Duch (pronounced "Doik"). This spring, 28 years after fleeing Cambodia ahead of the Vietnamese army, his trial for mass murder may finally get under way.

Now, in the first interview he has given since his capture more than eight-and-a-half years ago, he talks freely about how and why he sent 17,000 Cambodians to their deaths in the killing fields.