A search for a missing Auckland woman has been upgraded to a homicide investigation.
The disappearance of Bin "Cissy" Chen, 44, has baffled police, after she never returned home from her regular evening walk on the city's North Shore on Monday last week.
She left her Tobay home about 5.30pm and when she failed to come home her distressed partner raised the alarm.
Extensive land and air police searches of Long Bay reserve and the surrounding area have failed to turn up any sign of the woman. There have been no public sightings of her since she went missing, confirmed police.
Police would not say whether Ms Chen had touched her bank account or used her mobile phone since she was last seen.
A forensic examination is underway at an address in Torbay and a man is assisting police with the investigation, North Shore CIB confirmed.
Anyone with information on the whereabouts of Ms Chen is urged to call police on 08000 24779 or Crimestoppers anonymously on 0800 555 111.
