Driver would have turned 25 next week. He was living under a so-called peace bond that barred him from using social media and required him to undergo religious counseling when he was shot during a police raid in a small Ontario town.
He first came to the attention of police in December 2014 and was arrested in 2015 for supporting the militant group Islamic State on social media.
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He had openly spoken to Canadian media about his belief that Canada and its allies should expect retribution for their war against Islamic State.
"If a country goes to war with another country or another people or another community, I think that they have to be prepared for things like that to happen. And when it does happen, they shouldn't act surprised, they had it coming to them, they deserved it," Driver calmly told the Canadian Broadcasting Corp last year.
His former lawyer, Leonard Tailleur, said on Thursday that he was surprised by police reports that Driver had planned an imminent rush-hour attack on a major Canadian city, noting that Driver was a devout Muslim but also a "passive individual."
Family Schism
At the age of 7, Driver's mother died and he started growing apart from his father, who was then a soldier, Tailleur told Reuters.
"He blames his father for the death," Tailleur said. "Ever since that time, there was a serious relationship issue."
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He said that was part of what made Driver eventually abandon Christianity in favor of Islam.
"A bitterness that he had with his father - these are probably some of the undercurrents," Tailleur said. "A lot of his problems, internal problems, I think, stem from that."
Driver attended Friday prayers off and on in 2014 at Winnipeg Central Mosque, arriving late and leaving early, executive director Idris Knapp told Reuters.
"He wasn't very connected with anyone. Just a person in his own bubble. Most of the time people come to connect with community, he never seemed like he was making an effort," Knapp said.
According to Knapp some Winnipeg Muslims took umbrage with Driver's online postings, especially those aggrandising Islamic State or other militant groups.
It was in Winnipeg that he was placed under a peace bond, required to stay off social media, have no contact with militant groups and observe a curfew.
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Earlier this year Driver moved to Strathroy to live with his sister, still alienated from his father. Driver's father, identified by Canadian media as Wayne Driver, told news outlets that he was saddened by his son's death but not surprised.
He said his son had seemed lost and beyond reason in his support for Islamic State. He had hoped his son could be forced into a de-radicalization program.
"Our worst nightmare has come true," Wayne Driver told the National Post newspaper. "Aaron was a good kid who went down a dark path and couldn't find the light again."
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