A man and a woman found dead on a quiet street in Melbourne's east had recently separated, a shocked neighbour has said.

The 36-year-old Blackburn woman was found deceased in a white Audi SUV in Nunawading just after 6pm on Saturday. The 40-year-old Nunawading man died at the scene shortly after emergency services arrived.

An eight-year-old boy was found uninjured in the vehicle.

A woman was found dead in a car, and a man died shortly afterwards at a Nunawading property on Saturday night. Credit:Goya Dmytryshchak

Police taped off a block of units on Mount Pleasant Road and forensic officers and SES volunteers combed the area late into Saturday night as residents and passersby gathered on the street.