Police spokesman Mark Pugash says the condition of the other victims is not known yet.
The authorities have not yet determined a motive for the attack that took place in Toronto's bustling Greektown neighbourhood yesterday.
The colourful neighbourhood offers a unique mix of old and new, says Lichtman, noting the area has evolved dramatically as young professionals snapped up houses in leafy side streets, steps from the crosstown Bloor subway line.
"Our son had severe mental health challenges, struggling with psychosis and depression his entire life", the family statement said. Medications and therapy were unable to treat him.
"While we did our best to seek help for him throughout his life of struggle and pain, we could never imagine that this would be his devastating and destructive end", the statement said.
A video taken by a witness showed a man dressed in black clothes and a black hat walking quickly down a sidewalk and firing three shots into at least one shop or restaurant in Toronto's Greektown, a residential area crowded with Greek restaurants and cafes.
Officers will determine how the man died and whether there was any police wrongdoing. The agency probes all police-involved incidents in which someone is killed, injured or accused of sexual assault.
Hussain's parents said Monday that they were devastated by their son's "senseless violence".
Nick Balkos said he saw the shooter about 15 minutes after he had closed his restaurant.
"It was a very, very, very quick, dynamic incident that occurred in very short order, from start to finish", said homicide Detective Sgt. Terry Browne. "On behalf of all Toronto residents, I am outraged that someone has unleashed such a bad attack on our city and people innocently enjoying a Sunday evening".
Flags at her former high school and at school administration buildings will be lowered to half-staff, Malloy said.
June 24, 2018: Jenas Nyarko, 31, was killed when someone in an SUV fired a single shot into a auto in which she was a passenger returning from a funeral.
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Wilson said she tied and elevated their wounds and tried to keep them calm while they waited for paramedics. "I am still in shock".
Toronto Mayor John Tory said: "We were so use to living in a city where these things didn't happen". "Gun violence in any part of our city is awful and completely unacceptable".
"And then, I saw the carnage as I ran down the street here to kind of follow the gunfire", the man told the station, who described the scene as "pretty crazyn" the witness recalled.
'There must've been 20, 30 shots, altogether. It was a lot.
Toronto councillor Paula Fletcher told CP24 she heard that the gunman was emotionally disturbed. "She had been shot", she said.
"We were sitting out on the patio, and we heard shots, so we ran inside and he came in the restaurant and shot the girl right in front of me", she told the broadcaster.
Ontario's new Premier Doug Ford called it a "horrific act of gun violence" and said his heart went out to the victims.
Shortly after the shooting, Toronto Mayor John Tory told reporters that "guns are too readily available to too many people", according to the CBC.
Canada traditionally has relatively low levels of gun violence, particularly compared with the neighbouring United States.
Toronto, despite a murder rate lower than that of large USA cities, is grappling with a sharp rise in gun violence as gun deaths jumped to 26, up 53 percent so far this year from the same period in 2017.
"Why does anyone in this city need to have a gun at all?" he asked in an address to city councilors Monday morning.
Canada's Prime Minister Justin Trudeau reacted to the shooting on Twitter, writing, "My thoughts are with everyone affected by the awful tragedy on the Danforth last night in Toronto, and may the injured make a full recovery".