The police investigation had determined that the events surrounding the death of Buis first took place at the Unity Park lookout.
The initial incident prompted Buis to move toward Eglinton Rd, where he was struck and killed by a vehicle, he said.
The vehicle then left the scene.
Police serious crash analysts have examined the scene and were now reconstructing what happened.
"Police are focused on getting to the truth of what occurred and we are making good progress.
"We have interviewed a number of people of interest to the inquiry.
"However, we are confident there are members of the community who know what happened.
"We would like to hear from them," he said.
He urged the driver to come forward.
- Police 105/file number 220722/8806. Crime Stoppers 0800 555 111 or online via www.crimestoppers-nz.org