It's now believed the "unexplained death" of a man found unresponsive at an Auckland property on Monday was due to foul play.
A homicide investigation has now been launched after an autopsy was completed on the 66-year-old victim on Wednesday.
Det Insp Scott Beard said they are still appealing to the public for information about the death.
"While police had always been treating this investigation as a homicide due to our initial enquiries, the post-mortem has sadly confirmed the injuries received to the victim are violent and consistent with foul play."
Beard said it's believed the man died before Sunday afternoon due to his injuries.
"Our thoughts are with the victim's loved ones at this time and we are committed to holding the person, or persons, involved to account."
Beard said further details will be released about the victim once formal identification is complete.
Meanwhile, investigators "are very concerned for the safety and wellbeing" of Mei Han Chong and have asked the public for help in tracking her down.
Chong is described as of Asian descent, small in stature, with short dark-grey hair and possibly wearing glasses.
"Police have not yet located the 67-year-old, nor the vehicle which belongs to the family," said Beard.
Anyone who has seen a blue Kia Rio, registration NJN927, should contact the police.
The car was last seen at the property on Celtic Cres, Ellerslie, on Saturday after 11pm.
A scene guard will remain at the house while examination continues.
"Police will continue to remain in the area over the coming days while our investigation is ongoing," Beard said.
The public can contact police with information by calling 105, or going online here and referencing file number 231106/8053.
People can also call Crime Stoppers anonymously on 0800 555 111.
