Toronto police responding to shots being fired around 2:30 p.m. Wednesday on Birchmount Road discovered the body of a 27-year-old man in the hallway on the first floor of a building.
The victim was later identified as Vanacio Julien, a former resident of building.
Neighbors say Julien and his wife moved from a building about a year ago.
Eighteen-year-old Selvon Byers was later charged with second-degree murder.
It is unclear whether the victim and the suspect were known to each other.