Peel Regional Police were called to a basement apartment at Lancaster and Reindeer Drive to find a man in his 20s with a gunshot wound in his chest.
The man was pronounced dead at the scene.
No suspects have been named and there has been no motive determined. Police are canvassing the area looking for more information.
The homicide unit said they are unsure whether the man lived in the area or was visiting. An autopsy will be conducted Sunday.