24 February, 2018
The Toronto man was a subject of Project Prism, and police have said he had a sexual relationship with McArthur.
August 2015 - Soroush Mahmudi, 50, of Toronto, is reported missing.
Det. -Sgt. Hank Idsinga said in a one-on-one interview with CBC's The National earlier this week that he would provide new details about the investigation. At the time, Idsinga only identified one set of body parts - those that belonged to Andrew Kinsman. "There's hundreds of outstanding missing persons occurrences that we're looking at".
January 17, 2018 - Police uncover evidence suggesting McArthur was responsible for both Kinsman and Esen's deaths, along with the deaths of other unidentified people.
On 8 February, police say they found the remains of six people at the home of elderly residents who stored Mr McArthur's landscaping equipment in exchange for free lawn care.
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Police have interviewed some of McArthur's past known associates, but Idsinga said there is no reason to believe that the investigation now involves a hunt for other suspects. It is believed he was murdered between May 2016 and July 2017.
February 13, 2018 - Police say excavation at the home's backyard turned up no human remains, but suggest they may "revisit the scene" when the weather warms up. About two weeks later, police laid three more first-degree murder charges related to the disappearances of Kayhan and Mahmudi, as well as the death of Lisowick who had never been reported missing.
He said police have also identified at least two properties for potential excavation, but said forensic test results are needed before they can proceed.
That brings the number of men McArthur is accused of killing to six.
Court documents also indicate McArthur was convicted of assault with a weapon for attacking a man with a metal pipe in 2001.