Thembelihle Khumalo cannot rest until she finds out who - in a flurry of blows and kicks at the Pinetown taxi rank - murdered her son Mlungisi Nxumalo.
The gardener and father of four was beaten to death in November by a mob who accused him of trying to kidnap a child.
Nxumalo died after giving his friend and his son a lift, a charitable gesture that would have fatal consequences on the eve of his 44th birthday.
His friend, who tried to intervene, met the same fate, thrashed until he stopped breathing by a crowd that took the law into their own hands.
"What happened to [Nxumalo] is unforgettable, I can't forget about it," Khumalo, 69, said, clutching a handkerchief.
Nearly a year after Nxumalo died in a gutter surrounded by garbage, no arrests have been made.
In the wake of his killing, Khumalo's daughters took it upon themselves to canvass the taxi rank and found footage of their brother's final moments.
Angered by the slow pace of the investigation, they wrote to former president Jacob Zuma and the office of the KwaZulu-Natal premier, but their pleas for intercession apparently fell on deaf ears.
Police said Nxumalo had been sitting in the car with his friend's mentally challenged son.
Bystanders decided that the boy had been abducted and began assaulting Nxumalo and then overturned his car.
Crime analyst and violence monitor Mary de Haas said police inaction drove people to violence.
"It comes down to a virtual breakdown of policing and because of that collapse, people feel like their response is quicker and they end up taking the law into their own hands."..