Police said that from August 2017, when McArthur was first named as person of interest, to the months after when he was put under surveillance, they worked to ensure he would not kill again.
McArthur's string of murders has prompted an inquiry by a retired judge into how the Toronto police handle missing persons cases and whether their investigations are influenced by the sexuality or race of those who have vanished.
McMahon said: "All or most of the victims were vulnerable individuals who were lured to their death".
A man said that McArthur had tried to choke him in the back of his van but that he escaped.
McArthur had been in the middle of restraining a potential ninth victim identified as "John" when police arrested him. "This court can not give them what they want the most - which is their loved one back".
At a news conference on Friday afternoon, Toronto Police Insp. "A different standard of justice for racialized and LGBTQ+ people is the reality in our city and province".
The prosecution said that a frequent site of the killings was McArthur's bedroom and that he repeatedly strangled his victims either with his hands or with rope and a metal bar.
Two police investigations into the missing men returned no leads, even though McArthur's name came up during one investigation, and he was as a witness (not a suspect) during the later one. He was last seen in Toronto's gay village.
Some of the victims' friends and family members were too overwhelmed by emotion to read their sentencing statements to the judge, and prosecutors took over. He thanked both the prosecution and the defence, noting "it is not easy to defend a serial killer".
The last victim, Andrew Kinsman, was superintendent of McArthur's apartment building.
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