A man was found dead inside a Cadillac in a residential area of the city's east end on Friday morning.
Police were called to Irvine Road in Scarborough around 11:30 p.m. to investigate.
A citizen walking in the upscale neighbourhood phoned 911 about a silver Cadillac with dark, tinted windows parked on the street. Paramedics were first to arrive.
They found the car with its lights on, idling on the street with the victim slumped in the driver's seat.
According to police he had been shot in the head.
The name and the age of the victim have not been released.
Police say they have not recovered a weapon and have no description of any suspects.