BRAKPAN - Family and friends gathered in Brakpan to remember the life of Marius van der Merwe.
Van der Merwe was known as Witness D during his testimony at the Madlanga Commission.
He made damning allegations of rot within the Ekurhuleni Metro Police and the private security sector.
Van der Merwe was assassinated outside his home earlier this month.
His murder has reignited concerns about the safety of whistleblowers and state witnesses.
His family says it wants to see justice.