Cambodia's former Prime Minister Pen Sovann, who was installed then imprisoned by Vietnamese after they defeated the brutal Khmer Rouge regime, has died. He was 80.

He was the country's first post-Khmer Rouge prime minister from June to December 1981, when the country was known as the People's Republic of Kampuchea.

He died Saturday night from an illness at his hometown in southern Takeo province.

In late 1981, Pen Sovann was removed from power by Vietnamese in an ouster triggered by his calls for the withdrawal of the country's forces from Cambodia. He was imprisonment for 10 years in Hanoi.