Police were called to an alley near the corner of Moreau, between De Rouen and Hochelaga streets, on Friday at 3:00 p.m..
They found the body of a man in his 40's in a car.
Investigators say there's evidence that it's a suspicious death, and have cordoned off the area as a crime scene.
Police estimate the car was there for at least a couple of days.
Officers have brought in the canine unit to search the area for clues.
They will not yet comment on a possible cause of death.