JOHANNESBURG (Reuters) - South Africa s Justice Minister Michael Masutha on Friday denied parole to the killer of anti-apartheid leader Chris Hani, saying he had not expressed remorse for the murder. Janusz Walus has served more than 20 years of a life sentence for the assassination of Hani, who was a senior member of the now-ruling African National Congress (ANC) and head of the South African Communist Party. Walus, 64, emigrated from communist Poland in 1981 and became involved in far-right politics in South Africa.  He shot Hani outside the anti-apartheid activist s home in 1993. The killing triggered nationwide riots that threatened to derail South Africa s 1994 transition to multi-racial democracy after decades of white apartheid rule. Masutha also blocked Walus  parole application in 2015, a decision that triggered several court challenges. The Supreme Court of Appeal referred the matter back to the justice minister for reconsideration.  Masutha said on Friday a psychologist s report had highlighted Walus  political ideology as a risk factor. The report said Walus  expressed remorse for the fact that the victim s children are fatherless and the wife is a widow .  However, he showed no remorse for murdering Chris Hani. He still rationalizes his actions and insists that they were politically motivated. His ideas about communism still stand.  