Toronto Police have scheduled a news conference to update the media on the investigation into the 66-year-old self-employed landscaper and investigators wouldn't officially reveal any details on Thursday. He was arrested in January after an investigation into the disappearances of two men from a predominantly gay neighbourhood in downtown Toronto past year.
He said the remains of three other people were found in those planters, but police have been unable to identify them yet.
Idsinga said they laid the charge after identifying the human remains of Navaratnam and also of Soroush Mahmudi, buried in garden planters that were seized from the backyard of a residence on 53 Mallory Cres in January.
"There's even some ... occurrences where there's been a sudden death that we're looking at", he said. It is believed he was murdered between May 2016 and July 2017.
He added that police are tracing McArthur's whereabouts "as far back as we can go".
Meanwhile, police are now investigating what they believe is a murder scene in McArthur's apartment on the 19th floor of his building at 95 Thorncliffe Park Dr.
"I believe we have evidence on how some of them may have been killed".
Navaratnam, Kayhan and one other man were all reported missing from Toronto's gay village between 2010 and 2012, prompting calls for action from the community. He did announce that the force would review its practices in missing persons investigations.
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.
They later added three more first degree murder charges in the deaths of Majeed Kayhan, Mahmudi and Dean Lisowick.
Police are also looking at two other properties in the city, and have reached out to police forces overseas, where McArthur may have travelled, for help.
That brings the number of men McArthur is accused of killing to six.
He's scheduled to make his next appearance on February 28.