Police are interviewing several witnesses after what they describe as a suspicious death in Northland.
They said an ambulance crew found the 25-year-old man unconscious about midnight after a violent incident in the Whangarei suburb of Tikipunga.
He died by the time police arrived and his death was being treated as a homicide.
They said two people were now assisting them as they investigated the man's death.
One of them had been detained at the address where the victim was found.
Police believed they had a weapon that was used but a post-mortem had not yet been done.
They said there would be a scene examination with help from ESR specialists during the coming days.