A homicide investigation has been launched after an incident in Auckland's Mt Roskill on Friday morning.
Emergency services were called to an address on May Rd around 7:30am.
When they arrived a woman was found with criticial injuries.
"Despite efforts to save her, these were not successful," said Detective Senior Sergeant Scott Armstrong.
A man who was located nearby has been arrested and is helping police with their enquiries, Det Snr Sgt Armstrong said.
"Police have begun a scene examination and expect to be there for some time."
Auckland Transport said a section of May Rd, between Stoddard Rd and Memorial Ave, has now been closed, with motorists warned to allow extra time for diversions.