So far police have not found any links between Kanagaratnam and Toronto's Church-Wellesley Village or LGBT communities.
Idsinga said Kanagaratnam had never been reported missing to local authorities in Canada.
Detective Sergeant Hank Idsinga declined to comment on what Kanagaratnam's immigration status had been at the time of his death, and it's now unknown if he was an asylum seeker.
Kanagaratnam's remains were recovered from garden planters at a home in central Toronto where McArthur kept his landscaping equipment.
The identification was made possible with the help of an worldwide agency, the detective said, declining to provide further details.
Detective Sergeant Hank Idsinga of the Toronto Police Service said Kanagaratnam was born in Sri Lanka but moved to Canada in 2010.
Idsinga said police believe he was murdered sometime between September 3 and December 14 in 2015.
Idsinga said more remains might be found in the planters at the home McArthur used as storage and that 75 properties linked to the landscaper are under investigation.
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"He doesn't quite fit the profile of what we've seen before", Idsinga said.
The heavily edited image showing a bearded man who appeared to be dead was shared with the public as a "last resort", Idsinga said, adding it prompted hundreds of tips to pour in to police.
On March 5, investigators released a photograph of a deceased man who was believed to be a victim of McArthur, in an attempt to identify him.
Idsinga has previously said that investigators are examining 15 unsolved homicides that took place between 1975 and 1997.
During this time, McArthur allegedly murdered Mahmudi, a man who lived in Scarborough with his wife and hadn't come out to his family; Dean Lisowick, a sex worker who struggled with homelessness, and Selim Esen, a recent immigrant with few friends.
In August 2017, police launched Project Prism, which looked into the disappearances of Kinsman and Esen. Police plan to search them once the weather warms in early May.
In this artist's sketch, alleged serial killer Bruce McArthur makes an appearance via video in a Toronto courtroom, on April 11, 2018.