A former colleague who worked with Danforth shooter Faisal Hussain at the Leaside Loblaw's on Redway Rd. said he was "always happy, bubbly" and eager to please.
It is not yet clear whether he killed himself or whether he was shot by police.
The attacker fired a handgun into restaurants and cafes in a lively Toronto neighbourhood, killing a 10-year-old girl and an 18-year-old woman and wounding 13 other people. The neighbour knew the family and said Hussain declined to even participate in Friday prayers.
Jooyoung Lee, an associate professor at the University of Toronto who specializes in examining gun violence, said findings from recent years show many guns used to commit crimes in Canada have originated within the country.
The shooter is said to have suffered from "severe mental health challenges", according to the Hussain family.
The relatives say their "hearts are in pieces for the victims".
Toronto Police Chief Mark Saunders refused to speculate on a motive but told reporters he could not rule out terrorism.
That being said, he noted that "a number of groups and organizations made presentations to that effect earlier this year, and I said that we would be prepared to consider their arguments and we will do that". "It's going to take some time".
Toronto police have identified the 10-year-old girl killed in the shooting rampage over the weekend as Julianna Kozis.
Anthony Parise, who taught Fallon's Grade 12 English class, remembered her as "a leader among her peers" who planned to become a nurse.
Fallon graduated from Malvern Collegiate Institute just last month, said John Malloy of the Toronto District School Board. Eight women and seven men, ranging in ages 10 to 59, were wounded during the shooting, according to a report from the BBC.
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Witnesses heard a volley of shots and described the suspect walking past restaurants and cafés on both sides of the street, firing into them. "I'm angry when these kinds of things happen in the city - a lot of people will be angry", he said. They expressed shock at a shooting in such a neighborhood. But it's not yet known whether the gun was legally obtained.
Bouquets of flowers lay near a plaque commemorating the city.
Police are warning people to stay away from the area.
Police named the suspect in a shooting attack in the city on Sunday as 29-year-old Faisal Hussain, who family members said had been mentally ill all his life.
Suddenly, she and the other customers were told to run to the back of the restaurant.
Saunders said he wouldn't "get into the minutiae of the investigation", leaving unclear how many people were shot by the gunman and how many may have been struck by crossfire or ricocheting bullets.
She said it's important that the community comes together because residents of Greektown need support and positivity. Nobody was with her. That was the scary part, " Steinhauer said.
Toronto has deployed about 200 police officers since July 20 in response to the recent spate in shootings, which city officials have blamed on gang violence.
As investigators dug through Hussain's life, the attack has prompted debate over whether Toronto - which has consistently ranked as one of the most secure major cities in North America - was becoming less safe.
Toronto police say they have no information that he has traveled overseas recently.