Homicide Squad detectives are investigating the death of a woman in Noble Park.
Police were called to a Dunblane Road home about 10.50am on Friday 2 February.
They found a woman, yet to be formally identified, deceased inside the property.
Police took a man, believed to be aged in his sixties, into custody and was assisting police with their inquiries.
It is understood the parties were known to each other.
Investigators urged anyone with information to call Crime Stoppers on 1800 333 000 or submit a confidential crime report at www.crimestoppersvic.com.au.