Police responded to the shooting on Jamestown Crescent, near Kipling Avenue and Albion Road, at 10:50 p.m.
They found the victim outside, suffering from a gunshot wound.
He was rushed to hospital where he was pronounced dead. He had suffered a gunshot wound to the torso.
Police have identified the victim as Jarvis Montaque, 15, a Grade 10 student at Father Henry Carr Catholic Secondary School, who lived with his family in the community.
Montaque, according to police, was standing outside with a friends and family on Jamestown Crescent when a male suspect dressed in all black walked up to the group and shot the victim at close range.
Montaque was not known to police, said Det. Joyce Schertzer.
"He wasn't a troublemaker, he was a good kid," she said. "He was attending school, and he resided with his family in this community."
The 15-year-old boy is the fourth minor to die in the Greater Toronto Area from violence so far this year.
Police say the family was originally from Jamaica and had been in Canada a little less than two years.
CBC News reporter Jermaine Hylton was at the scene on Monday morning and spoke with a man named Sammy who knew Montaque well.
News of Montaque's death was painful, he said.
"It hurt me really bad," he said.
The man, who is a friend of the boy's family, said Montaque kept to himself.
"He was a very good kid," he told CBC News. "He never got himself into trouble, and he didn't intend to get into trouble. He intended to go school and learn."
Bibi Santsarran, who lives in the townhouse complex where the teen was gunned down, said he was from a "very decent family."
Her son went to school with Montaque, and she knew his sisters and mother.
"It touches your heart, right, because it could be my kid too …They're a pretty good family," she said.
In September, two young men were fatally shot in the same neighbourhood.
So far there's no word on what led to the shooting.
Police are calling for witnesses, or anyone who has information about the shooting, to contact the homicide squad or Crime Stoppers.
Violent Sunday in the city
Sunday was a violent night in the Toronto. An 18-year-old man was shot in the leg near Jane Street and Church Street at around 9:30 p.m. The victim was taken to hospital and is expected to survive.
There was also a home invasion in Scarborough at 9 p.m. on Park Street near Danforth Avenue
Two men were stabbed, one of the victims was taken to hospital with non life-threatening injuries.
Also Sunday, police arrested and seized a 9 mm handgun from a 16-year-old boy near Yonge and Gould streets in downtown Toronto. The teenager, who cannot be named under the Youth Criminal Justice Act, now faces several gun-related charges, including possession of a restricted firearm with ammunition.