Last week, police said they found two sets of human remains behind a residence at 53 Mallory Crescent where the 66-year-old landscaper worked.
Toronto police were brought back to the location after cadaver dogs indicated there were areas of interest that needed further investigation.
The remains, which have yet to be identified, were sent for testing on Monday but results have not been released.
Det. Sgt. Hank Idsinga, the lead investigator in the case, said on Friday their search efforts were concentrated at a compost pile located behind the backyard of the Mallory Crescent property where remains of seven men were found in large planters earlier this year.
McArthur is charged with eight counts of first-degree murder for the deaths of men who had ties to the city’s Gay Village.
The remains of one of those men have yet to be found.
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