Farmworker jailed for life for ET's murder
Suspended sentence for the minor
Chris Mahlangu killed AWB leader Eugene Terre'Blanche over a pay dispute in April 2011 at his home in Ventersdorp, about 125km west of Johannesburg.
Judge John Horn said the attack was not racially motivated.
A second man, who was a minor at the time of Terre'Blanche's murder, was found guilty of housebreaking and given a suspended sentence.
Prosecutors said Mahlangu and his co-accused broke into Terre'Blanche's home, where they found the 71-year-old asleep and hacked him to death with an axe.
A social worker previously told the High Court sitting in Ventersdorp that Terre'Blanche's widow Martie harboured no feelings of hatred towards his killers.
As quoted by Beeld, Johan Engel said he had interviewed Martie Terre'Blanche in June to determine the impact of her husband's murder on her family.
"I want to reclaim my perspective on life, this court case has been a huge setback. I do not hate the accused, and I'm not bitter... [although] they crushed me and they murdered my husband in the most barbaric way," she told Engel.
She said she still died "ten deaths" when she drove past his farm, Witrandjiesfontein, where the murder happened.
Mrs Terre'Blanche said they would still eventually have to face divine justice.
Engel then told the court that the murder of a loved one was one of the most traumatic things a person could experience.
The social worker also spoke for Patrick Ndlovu, who was 15 years old at the time of the crime, which was in April 2010.
Engel, who is from the Bosasa Place of Safety where Ndlovu had been incarcerated for the duration of the trial, told the court he believed Ndlovu should be released into the community.