Among those killed was 41-year-old Sergeant Stewart Graeme Guthrie, who was the sole charge officer at Port Chalmers Police Station and immediately responded to reports of shots being fired.
He knew Gray, and Guthrie and another officer, Constable Russell Anderson, located him at his home.
Gray shot and killed Guthrie when the police officer challenged him.
Guthrie's nephew, Superintendent Jason Guthrie, said he was proud of his uncle.
The property in Aramoana where David Gray was shot and killed. Photo / Logan Church
"I always admired and was very proud of the work he did as a police officer."
"On days like today the grief of those who knew those who died is felt as keenly as it was all those years ago," said Police Commissioner Andrew Coster.
"There are also many others still living who will be reliving the emotions they felt on that day."