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Robert Petit is a Canadian lawyer who during 2006 and 2009 was the International Co-Prosecutor for the Extraordinary Chambers in the Courts of Cambodia, which is aiming to try Khmer Rouge leaders for violations of international criminal law in Cambodia between 1975 and 1979. He led the investigation and prosecution of five senior most leaders of the Khmer Rouge namely Nuon Chea, Ieng Sary, Ieng Thirith, Khieu Samphan, and Kang Kek Iew. The last was recently convicted for war crimes and crimes against humanity. Petit also initiated the prosecution of five other Khmer Rouge leaders whose cases are still under investigation by the United Nations-backed tribunal.