Homicide Squad and Professional Standards Command detectives are investigating following the death of a man in Glen Waverley last night (24 June).
Police were called to a Madeleine Street home following reports of a man behaving erratically just before 8pm.
Police and Ambulance Victoria paramedics were at the home when the man appeared to suffer from a medical condition.
Despite the efforts of emergency service personnel, the man died at the scene.
The man is yet to be formally identified.
A post mortem examination will be conducted to try and determine the cause of death.
All deaths in police custody are investigated by the Homicide Squad, with oversight from Professional Standards Command as per standard practice