McArthur, wearing an orange prison jump suit, appeared by video in a Toronto courtroom Wednesday morning to be charged with first-degree murder in the case of Abdulbasir Faizi, an Afghan immigrant who went missing in 2010.
Idsinga said police plan to investigate at least 70 more properties where McArthur is believed to have worked, adding that the operation may get underway as early as next month. "We just don't know yet".
In February, investigators charged McArthur in the disappearance of Navaratnam.
Some of the remains, police said, belong to 49-year-old Andrew Kinsman, 50-year-old Soroush Mahmudi, and 40-year-old Skandaraj Navaratnam.
The relative said police initially believed Faizi had left on his own accord, resulting in his wife divorcing him as she believed he abandoned her and their two daughters.
Many of McArthur's alleged victims were subjects of previous police probes into the disappearances of men from the city's gay village.
They have not specified how the victims were killed. Police also remain on the scene of McArthur's east-Toronto apartment, calling it an unprecedented investigative scene.
Police have trying to identify the remains of several men found at a property McArthur used as storage for his landscaping business and say he targeted men he met through dating apps that cater to gay men, meeting them at bars in the "Gay Village" area of Toronto, as well as male prostitutes.
January 29, 2018 - McArthur is charged with first-degree murder in the deaths of Mahmudi, Kayhan and Lisowick.
Toronto's LGBT+ community has demanded an investigation into the police's review of the case.
Idsinga said that some people have been reluctant to come forward to say that McArthur worked on their properties.
In August 2017, police launched Project Prism, which looked into the disappearances of Kinsman and Esen.
Police also released a new version of the photo, enhanced by LGBT activist Nikki Ward, and an artistic rendering of the man in hopes of getting more tips. "I think it's easily set the record for a forensic examination of an apartment".
Sgt. Hank Idsinga says releasing the image is a "last resort" to find the man's identity.
Although he was interviewed, the police closed the investigation in 2013, and had not reached a conclusion regarding the fate of the three men.
Toronto police continue to be in discussions with various other police agencies, including internationally, about the investigation.