Michael Zehaf-Bibeau, 32, had moved across the country to westernmost British Columbia province to try to start over following a drug conviction in Montreal.
Disillusioned and addicted to crack cocaine, he was drawn to Islam a decade ago as he tried to turn his life around, Canadian media reported, but ended up driving Muslims away as he became increasingly radicalized.
The Globe & Mail newspaper said he would preach to non-Muslims one day and smoke crack cocaine the next.
At one point in Vancouver, he tried to turn himself in for armed robbery but a police officer could not find any record of the alleged 10-year-old crime, so refused to arrest him, the Vancouver Sun reported.
Instead he was taken to a local hospital for observation but psychiatrists quickly cleared him of any mental illness, so he was driven to a detox center. They refused him because he was not intoxicated.
Soon afterward he was arrested for robbing a fast food restaurant and asked to be kept in jail, hoping there he would get help.
"I'm a crack addict, and at the same time, I'm a religious person," Zehaf-Bibeau told the judge in 2012, according to a court audio transcript cited by the Vancouver Sun.
"I want to sacrifice freedom and good things for a year maybe, and when I come out, I'll appreciate things in life more and be clean, or maybe get therapy if you guys can -- like a detox."
At an Ottawa shelter where he stayed for a few nights before the attack on parliament, residents and staff offered mixed observations, according to the Globe & Mail.
"He was very pious... But he seemed very extreme," shelter volunteer Abdel Kareem Abubakir told the newspaper.
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