ソン・セン
On 10 June 1997 Khieu Samphan (former State Presidium Chairman of Democratic Kampuchea) declared that Yun Yat and Son Sen had been arrested as spies of Hun Sen and Vietnam, and declared as traitors. Yun Yat, Son Sen and eight of their relatives were executed on 15 June 1997 by the Khmer Rouge rump state.