The emergency services were called to a home in Kyneton, at 3.45 pm after reports of an assault.
The police found the woman in the scene with what is believed to be assault injuries.
She was treated at the scene, but could not be saved.
The police said the death is being treated as suspicious.
The Lavender Lane properties has been isolated and a crime scene established.
Specialist forensic examiners are expected on stage tonight.
Anyone with information is asked to contact Crime Stoppers on 1800 333 000 or visit the web site https://www.crimestoppersvic.gov.au .
Originally published as Woman dies after suspected assault