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(FILES)-- A file photo taken on July 21, 1998 in Pretoria shows Eugene De Kock, who was sentenced to 289 years imprisonment and life sentence for 87 crimes, being guarded by a prison warder at the Truth and Reconciliation Commission (TRC) hearing. Apartheid-era assassin Eugene de Kock, a police colonel known as 'Prime Evil', was refused parole on July 10, 2014 after serving 20 years in prison. "I have not approved parole at this stage," South African Justice Minister Michael Masutha told a news conference. AFP PHOTO / WALTER DHLADHLA