Toronto police were called to the scene of a shooting at 11 Main St., near Kingston Road, at approximately 11:15 p.m. Saturday.
A 26-year-old Toronto man was found in a fifth-floor hallway, suffering from a gunshot wound.
The victim was taken to hospital, where he succumbed to his injuries.
Late Monday evening, police issued a news release identifying the victim as Cory Campbell.
A post-mortem examination determined that Campbell died of a gunshot wound to the chest.
Police arrested a male suspect in connection with Campbell’s killing on Monday.
Andrew Burnett, 25, of Toronto, is charged with first-degree murder. He is due to appear in a Toronto court on Tuesday.
Police say a second person “remains outstanding.”