Sandile Tembe was gunned down outside a tuck shop near his home at eMfihlweni Royal Residence on Saturday.
Police say the gunman fired multiple shots at Tembe and fled in a vehicle, along with two accomplices.
East Coast Radio reported that the 32-year-old was a prominent member of the Manguzi Policing Forum and actively fought against cross-border crime.
Tembe’s also the nephew of the local Tembe Clan Chief, Inkosi Mabhudu Tembe.
“What is more concerning is that this incident comes just a week after the murder of another prominent fighter against the Manguzi cross-border crime syndicate, Judah Mthethwa. Police must scour every corner to find those responsible for these callous murders,” said KZN Premier Nomusa Dube-Ncube.