Detective Sgt Hank Idsinga, the lead investigator assigned to the case, stressed that he was releasing the photo to the public as a last resort, having failed to identify the man by all other means.
Idsinga said the latest unidentified remains were recovered from a planter at a Toronto property where McArthur worked as a landscaper and where the remains of the six alleged victims had been found. Tests are ongoing in an attempt to continue to identify these victims.
The man in the victim photograph appeared to be in his 40s or early 50s, with dark hair and a beard, and bruises on his face.
'It is obviously a key piece of evidence that we have that we are releasing, but we feel by releasing it, hopefully we can identify him and close off that area of the investigation'.
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"I've never done this and I do it with great hesitation", Detective Sergeant Hank Idsinga told reporters at a press conference on March 5.
One of the focuses of the investigation has been on human remains found within planters at 53 Mallory Crescent.
They were found in large planters at a home where McArthur did landscaping work and stored items, authorities previously revealed.
McArthur, 66, has been charged with six counts of first-degree murder in the disappearances of Andrew Kinsman, Selim Esen, Majeed Kayhan, Soroush Mahmudi, Dean Lisowick and Skandaraj "Skanda" Navaratnam.
Nearly all of the charges against McArthur were laid before police identified the remains of the victims. He will be joined by Dr. Michael Pollanen, Chief Forensic Pathologist for the Province of Ontario.
"We have used a multidisciplinary approach to try to find the truth behind what happened", he said.
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DNA analysis could take months.
"You can imagine that the state of decomposition and the dismemberment process requires us to reconstruct remains and then collect all of the relevant data".
"We still have four sets of unidentified remains", he said.
The investigation has been hampered by the cold.
Idsinga said the photo was released after police exhausted all other avenues to identify the man.
Numerous other alleged victims frequented the "Gay Village" area of Toronto where police believe they met McArthur through gay dating apps, CBC reports. All of the six named victims are men, and McArthur had relationships with each of them, some of which were sexual, Toronto Police Service spokeswoman Meaghan Gray said. Police found the man tied up on a bed, but unharmed.
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