Heidelberg Police are looking for a Xhosa speaking man known as Ngungubane to assist them in the investigation of the death of Mr Nhlapo.
The old blind man was not seen for some weeks and his decomposed body was only discovered on January 20.
Nlapo is from Duduza, but stayed in the shack at an old mining house in Plein Street, Rensburg.
Police are looking for Ngungubane, who was staying with the old man and helped him around the house. Ngungubane is estimated to be 1.4m tall, dark complextion with a mustache. He was last seen early in December in Plein Street, but is believed to be from Extension 23 in Ratanda.
If you know anything about the whereabouts of Ngungubane, please phone Heidelberg detectives on 016 341 0400 or Heidelberg Police Station on 016 341 0372.
