McArthur came under suspicion in September 2017 in connection with the disappearance of Mr Kinsman, but police at first rejected suggestions that a serial killer was prowling Toronto's gay neighbourhood.
Police say they have not linked the new remains found to the just released photographed.
"I do not want to release this picture and I'm doing so as a last resort", Idsinga said. "It's obviously a key piece of evidence that we have that we are releasing, but we do feel that by releasing we will identify him and close off that area of investigation".
It says this news will be "one of a host of details to be announced by police at a news conference Monday morning".
All six men allegedly killed by McArthur had disappeared from Toronto's gay village or had ties to the city's LGBTQ community.
At the same news conference, officials announced that a seventh set of remains were found at the same home where the other six prior bodies were located.
He added that they won't be releasing a cause of death until the investigation is concluded.
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Idsinga said previously that investigators are probing missing persons cases dating back decades.
McArthur, 66, already faced six murder charges.
McArthur is also charged with the murders of 58-year-old Majeed Kayhan, 47-year-old Dean Lisowick, and 44-year-old Selim Esen. In February, he was also charged in the death of Skandaraj Navaratnam.
Examiners have also not yet determined cause of death on numerous victims, with decomposition severely hampering their ability to get a complete picture.
Last month, police confirmed that the remains of Kinsman, Mahmudi, and Navaratnam were found along with the remains of three not yet identified people in garden planters on a property on Mallory Crescent where McArthur stored items for his landscaping business.
"We still have four sets of unidentified remains", Idsinga said. "This is through teamwork because we need to utilise many different scientific disciplines - pathology, antrophology, dentistry, fingerprints, all of these different modalities are integrated together to understand what's happened".
Michael Pollanen, Ontario's chief forensic pathologist, called the McArthur case a "unique investigation in the history of our organization", and pointed to a number of challenges that have impeded progress.
Investigators could not explain how it's taken this long to find all of these remains when they were all located at one home.
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Along with it, he shared pictures of the family celebrating Holika. "Wishing everyone a Happy Holi! " tweeted the Prime Minister. Many people were seen taking selfies with their mobile phones, capturing the colorful moments during the celebration.