A U.N.-backed tribunal’s Supreme Court lengthened the sentence for the Khmer Rouge’s chief jailer to life imprisonment on Friday because of his “shocking and heinous” crimes against the Cambodian people.

The surprise ruling increased a lower court’s 19-year sentence for Kaing Guek Eav, known as Duch. Prosecutors had appealed the sentence as too lenient, and outraged survivors had feared the man who oversaw the torture and killing of thousands could one day walk free.

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