Police were called to the Somerset Avenue home at Redwood Park after a woman was found unconscious just before 8am.
The 26-year-old couldn't be revived.
Police were at the scene for several hours door-knocking neighbours and gathering evidence.
9News understands detectives were searching for vision of a black car of interest.
Neighbour Matthew Thomson told 9News it had left the community in shock.
"It's definitely tragic," he said.
"Really, really unfortunate news for the family."
Police are preparing a report for the Coroner.
Anyone who has any information that may assist the investigation is asked to contact Crime Stoppers on 1800 333 000 or online.