A woman has died after suffering multiple stab injuries at a home in Sydney's north-west.
Paramedics performed CPR on the woman, aged in her 30s, at the Oatlands unit on Ingleby Street.
She was taken to Westmead Hospital but has since died.
A 25-year-old man who was known to the woman was arrested at the scene and has been taken to Granville Police Station for questioning.
NSW Police Chief Inspector Adam Philipps described the woman's injuries as "significant".
He said another man who was also in the unit at the time "fled the scene" before contacting triple zero and alerting police to the stabbing and providing the address.
"He's not an offender and we have located him and [he] is currently helping us back at Granville Police Station with a statement," he said.
He said the alleged offender had suffered a number of minor injuries to his hand and the man who ran from the scene also had a superficial injury.
Police believe the woman knew both men but officers are "still trying to establish the actual relationship of the parties involved".
It is unclear why the three were at the unit at the time of the stabbing.
"The injuries the woman sustained were significant and the police escort was used to help rush the woman to hospital," he said.
He said the man police arrested was waiting on the verandah for officers to arrive and he "wasn't aggressive" towards them when they turned up.
"We are still in the infancy of the investigation," he said.
"We are currently doing a canvassing of the units and we're just hoping now to try and put some sort of picture around not only today's incident, but the relationship of the female and the two parties involved today."
