A Hamilton man says he was not surprised to hear that a fatal assault had occurred at his neighbour's property in Chartwell.
Police were often at the home making inquiries, he said.
Emergency services were called to a Winstone Ave address shortly before 2pm yesterday, district crime manager, Detective Senior Sergeant Nigel Keall said.
"Ambulance staff were treating a 38-year-old man at the address for significant injuries. However, despite their efforts the victim died at the scene," Keall said.
A man who identified himself as the victim's brother said his brother had been stabbed. He declined to be named.
A homicide investigation has been launched.
The neighbour, who also did not want to be named, said a woman aged about 40 lived at the house with "at least five" children, both male and female.
He thought some of the older children, who would "come and go", were about 20 years old.
Police were at the home "quite a lot", he said.
He said the family were "pretty good neighbours", but he was "not surprised" when told a serious incident had taken place.
"The mother was really nice. One of the boys kicked down my letterbox once, but apart from that [they were good]," he said.
The family had moved to Hamilton from Auckland and had lived at the address for about 19 months, he said.
The family's modest brick and weatherboard house, which was down a long driveway and backed onto a small reserve adjacent to Porritt Stadium, was cordoned off when the Waikato Times arrived.
Police would like to hear from anyone in the area of Winstone Ave, Chartwell, between 1pm and 2pm who may have seen anything suspicious.
Anyone with information should contact Hamilton Central police on 07 858 6200.
Alternatively, information can be left anonymously with the independent organisation Crimestoppers on 0800 555111.