Kang Kek Iew

Kang Kek Iew or Kaing Kek Iev, also romanized as Kaing Guek Eav (), "nom de guerre" Comrade Duch or Deuch (មិត្តឌុច); or Hang Pin, (17 November 1942 – 2 September 2020) was a Cambodian war criminal. He was leader in the Khmer Rouge movement, which ruled Democratic Kampuchea from 1975 to 1979. 
He was responsible for the Tuol Sleng (S-21) prison camp where thousands were held for interrogation and torture, after which many of these prisoners were eventually executed.
Kek Iew died at the age of 77 at a hospital in Phnom Penh on 2 September 2020. The cause of death was lung disease.