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Prince Sisowath Sirik Matak (January 22, 1914 April 21, 1975) was a member of the Cambodian royal family. He was mainly notable for his involvement in the 1970 right-wing coup against his cousin, Prince Norodom Sihanouk, and for his subsequent establishment, along with Lon Nol, of the Khmer Republic. He refused to flee the advancing Khmer Rouge and was captured and executed in April, 1975.