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Hussain died after an exchange of gunfire with police. His family has said he suffered from lifelong "severe mental health challenges" including psychosis and depression and had not responded to numerous treatment approaches, including therapy and medication.
Late Tuesday, authorities identified the 10-year-old girl who was slain as Julianna Kozis of Markham, Ontario. Toronto police released a photo of the smiling, young girl and said her family had asked for privacy during their time of grief. Police previously identified the other person killed in the shooting as 18-year-old Reese Fallon of Toronto.
The mass shooting in Toronto's Greektown neighborhood stunned people in a normally safe city, already unsettled by an attack just three months ago when a man used a van to plow over pedestrians on a downtown sidewalk, killing 10 people and injuring 14 in an attack apparently aimed at women.