According to reports, the Darnall teenager dived into the river to save his neighbour, Bandile Makhoba, who had been washed away during the deadly floods last week.
Police search and rescue, the K9 unit, National Sea Rescue Institute and the IPSS aquatic division combed the banks and waters of the Nonoti River searching for Nzuza and Makhoba.
Makhoba's body was discovered on Wednesday.