Homicide Squad detectives are investigating the circumstances surrounding the death of a woman in Darley on Saturday night.
Emergency services were called to an address in Egan Court about 10.30pm.
On arrival police found a woman believed to be in her 60s with critical injuries, she could not be revived.
A man, believed to be in his 20s, has been taken into custody and is assisting police with their enquires.
Investigators are not looking for anyone else in relation to the matter.
Anyone with further information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.auExternal Link