McMahon said that even if McArthur lives to 91, the chances of him getting parole are remote at best.
The prosecution had argued that 50 years is a measured number and would confirm for the families that they will never have to relive this again through a parole hearing.
McArthur also pleaded guilty to the first-degree murders of Skandaraj Navaratnam, Abdulbasir Faizi, Majeed Kayhan, Soroush Mahmudi, Kirushna Kumar Kanagaratnam, Dean Lisowick and Selim Esen.
McArthur specifically targeted gay men in Toronto using gay dating apps.
And because McArthur pleaded guilty to eight counts of first-degree murder, he faced eight of those sentences.
Toronto police have faced criticism over the length of time it took them to confirm that a serial killer was stalking the Gay Village and to arrest McArthur.
An independent review of how the case was handled by police is being carried out following criticism of how the case was handled and how McArthur got away with a seven-year killing spree. David Dickinson said, "It has spared the community and those who knew the victims a lengthy trial".
"We will continue to do what we can to support the community and look for opportunities to improve our relationship", Gray said in an email to The Washington Post.More news: National Pizza Day 2019: Where to find free and cheap pizza today
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Now, with the trial over, advocates want to put the focus back on why so many died before police cracked the case. And while the nightmare he brought upon Toronto's LGBTQ community has finally, officially come to a close, I can't help but call it a shame that any possibility of this man seeing the light of day ever again - however minuscule the possibility - exists.
Court heard that many of them were immigrants and of South Asian or Middle Eastern descent.
In his victim impact statement read earlier this week, Jalill Kayhan, brother of Majeed, said the family had agonized over his disappearance since 2012, not knowing where he went, what happened to him, and then, finally being notified of his "horrific and brutal murder".
On the day McArthur was arrested, January 18, 2018, police surveilling McArthur saw a man, identified in the agreed statement of facts as "John", meet up with McArthur and enter his apartment. Police said he was likely killed sometime between September and December 2015.
He sited the USB found with the sub file titled with the names of McArthur's victims and containing photos of them, both alive and dead, as something done "no doubt for his own perverted sexual gratification".
McArthur posed their bodies for photographs, with numerous pictures featuring the same fur coat. Craig Harper, another prosecutor, said the term "serial killer" was "woefully inadequate to describe his moral blameworthiness".
September 2017 - Project Prism officers identify McArthur "as someone to be included or excluded as being involved in the disappearance of Andrew Kinsman". He was last seen in Toronto's gay village.
The details were made public this week by Crown attorney Michael Cantlon as part of the sentencing of McArthur, who lured the men to his home, strangled them and dismembered them, according to CTV News.