Two arrests have been made in relation to those matters.
Mr Harris, also known as John Boy, from Horeke, was driven by two men to the St John Ambulance with a gunshot wound to his chest on October 18, 2016.
He was loaded into an ambulance but died at the station about 6.40am. The death prompted a large police operation as the ambulance station on Western Hills Drive was cordoned off.
Nicky Bryan Dodd, 41, from Raumanga, was arrested last month and charged with one charge of murder in relation to Mr Harris' death. Dodd also faces two charges of wounding with intent to cause grievous bodily harm, two of unlawfully carrying a firearm, and one of perverting the course of justice.