Toronto police were called to an address in the Upper Canada Drive and Montressor Drive area last Thursday, where a man was found with "obvious signs of injury."
The man was pronounced dead at the scene. Police have since identified the victim as Travis Tash.
An autopsy has determined that Tash died of a gunshot wound.
Police are asking anyone with information to contact investigators at 416-808-7400. Tips can be passed on anonymously through Crime Stoppers at 416-222-8477.