Police have identified 17-year-old Joseph Petit as the teen who was shot and killed on Monday evening in the city's east end.
Petit was shot just after 6 p.m. on Monday at Dentonia Park and Thyra Avenues, in the area of Victoria Park and Danforth Avenue.
Police say Petit had been walking his German shepherd dog shortly before he was shot.
After returning the dog home, he immediately left again to meet two males outside.
Investigators say a brief conversation lead to a struggle, and then one of the suspects shot Petit.
The two male suspects then walked toward Victoria Park subway station.
Petit was rushed to hospital suffering from a single gunshot wound, and on Thursday he was pronounced dead.
Anyone with information is asked to contact police at 416-808-7400, Crime Stoppers anonymously at 416-222-TIPS (8477).
Petit is Toronto's first homicide victim of 2016.