Several assaults happened in the area at Waihi Beach where 64-year-old Murray Wilkinson was fatally stabbed early on New Year's Day, police say.
Police said today they were piecing together the events in the area at the time from information and images provided by the public.
"We knew there were a lot of people, predominantly intoxicated youths, in and around the area where the attack took place, and we have confirmed there were several incidents of assaults and disorder," Waikato district crime manager Detective Chris Page said.
"What the response to appeals for information and images has done however, is enable us to identify people, places and times as we piece together the various parts of the jigsaw of our investigation."
Page said members of the public had provided hundreds of images, enabling investigators to build an accurate picture of what happened in Waihi Beach shortly before the stabbing.
Despite the information and images already provided, he said police still wanted to hear from people who were in the area and had not spoken to the inquiry team.
About 30 police staff are working on the case.
The property where expatriate New Zealander Wilkinson was stabbed has been blessed by local kaumatua.
The dead man's family gathered for the blessing and are now preparing for a private memorial service this week.
Wilkinson died in Waikato Hospital on Thursday from stab wounds received in an attack outside a caravan parked in the driveway of a friend's Waihi Beach home early on January 1.
He and his wife were sleeping in the caravan and he was attacked while investigating a noise outside.
Page said the scene examination of the property was completed during the weekend, and the house had been returned to the family.
An extensive search was carried out in and around nearby properties.
Items of interest had been recovered, including several knives.
Members of the public with information could contact the inquiry team at the Waihi or Waihi Beach police stations or via the Operation Brad crime line, 0800 OP BRAD (0800 672 723). Alternatively, anonymous calls could be made to Crimestoppers on 0800 555 111.