Sheridan thanked members of the public who provided information to assist in the investigation.
“Holding to account all responsible for Damon’s murder has been the focus for our investigative team, and we hope this brings some relief to his family,” Sheridan said.
As the matter is before the courts, police are unable to comment further.
Earlier in the year, a 19-year-old man was charged with murder and a 21-year-old man was charged with murder and unlawful possession of a firearm.
Emergency services were called to a Coromandel Court address about 7.30pm on January 20 after a man was reported to have been shot.
O’Rourke was taken to hospital, where he died a short time later from his injuries.
Jaime Lyth is a multimedia journalist for the New Zealand Herald, focusing on crime and breaking news