A South Auckland woman, who was stabbed on Friday, has died in Middlemore Hospital.
A St John spokesman said they were called to an incident at 11.26am involving a woman and were directed to another incident "further down the road" where they found a man dead.
It's understood the dead man stabbed the woman in the chest at a block of flats in Great South Rd, Manurewa, before fleeing the scene.
His body was found near railway tracks a short time later.
Police and St John staff tried to resuscitate him without success.
Detective Inspector Jim Gallagher said police were not looking for anyone else in relation to the incident.
The incident is believed to have happened in unit three of the apartment block, but police won't confirm that until the man's next of kin have been informed.
A neighbour in the apartment block said she heard a scream and within minutes police were at the scene.
"The cops told us someone got stabbed but that's all I know," she said. "They took someone away in an ambulance."
The neighbour said the couple who lived in the unit were quiet but enjoyed drinking.
Because of the man's death, Veolia closed the railway line between Homai and Papakura at 12pm at the request of police but spokeswoman Stephanie Morison said it was reopened at 2pm and normal services would be resumed later this afternoon.
Police want anyone who saw an Indian man in his 30s walking along Great South Rd carrying a bag to call them on 09 261 1300 or Crimestoppers anonymously on 0800 555 111.
- © Fairfax NZ News
Do you wear a lifejacket when you are on the water - no matter what vessel you are in?