Faizi's disappearance in December 2010, along with that of Navaratnam and Majeed Kayhan, who went missing in 2012, prompted Toronto police to launch missing persons task force Project Houston, which was shuttered after 18 months.
Police also spent months combing the property where the remains were found and also sent cadaver dogs to more than 100 properties linked to McArthur.
McArthur appeared before Ontario's Superior Court of Justice for about 20 minutes on Tuesday morning.
The Crown Prosecutor read out an agreed statement of facts to the courtroom with details of the murders, including they were all committed during sexual acts or while victims were unlawfully confined.
He was last seen on a surveillance video getting into McArthur's van on June 26, 2017, and his DNA was later found inside, as was the ligature with which he was apparently strangled.
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Bruce McArthur, a 67-year-old landscaper, was arrested last January, and most of his victims - some of whose remains were found on a property where he worked - had ties to the Gay Village area in downtown Toronto.
Ultimately, McArthur was charged with and admitted to being responsible for the deaths of Selim Esen, 44, Andrew Kinsman, 49, Majeed Kayhan, 58, Dean Lisowick, 47, Soroush Mahmudi, 50, Skandaraj Navaratnam, 40, Abdulbasir Faizi, 42, and Kirushna Kanagaratnam, 37.
McArthur kept a notebook owned by Esen, which police later found in the serial killer's apartment.
Toronto police Detective David Dickinson acknowledged that police may have slipped up during the initial investigation and said officers should learn from their mistakes.
He was later charged with six additional counts of first-degree murder following the discovery of six more remains.
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The force's cold case squad is now investigating a series of homicides in the 1970s related to men with ties to the gay village, but Idsinga has said they've found nothing to link those to McArthur. The city's LGBTQ community had long said a killer was preying on men who vanished from the area.
The admissions bring an end to a mystery of disappearances that have plagued Toronto's gay community, the largest in Canada, for years.
"It has been a long and traumatic process and many made the hard decision to attend in person today", he said, according to Toronto police.
"Terrible things were done", she said.
December 8, 2017 - Police Chief Mark Saunders says the force will review its practices in missing persons investigations.
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His family reported him missing, but because they didn't know his ties to the Village, his disappearance largely flew under the radar of Toronto's LGBT community.