The 52-year-old's body was found in the Reid unit on Saturday, after neighbours noticed a strange smell. A resident managed to make his way into the man's apartment, and found him dead inside.

The man had suffered a single knife wound.

Police were called, and detectives, forensics, and other officers began investigating the death to determine whether there were any signs of foul play. Sections of the block of flats, just opposite the Canberra Centre, were taped off for days as police continued their investigations, searching rubbish skips, interviewing residents, and assessing the scene.

The man was described by neighbours as kind-hearted but troubled.

Police initially held off on declaring whether it was non-suspicious. But the results of an autopsy were released on Wednesday and confirmed that there were no suspicious circumstances surrounding the death.

The death of the man - who was a father, a furniture designer, and originally from Canada - will now be referred to the ACT Coroner, who will formally rule on a cause of death.

His body was the third found in Canberra units in a week, although none of the deaths are linked in any way.

The other two deaths are being treated as homicides, and police are continuing to investigate, with no charges laid as of Wednesday afternoon. Acting Deputy Chief Police Officer Paul Shakeshaft said the investigations had put ''some strain'' on resources within ACT Policing, but said the force was well equipped to handle major concurrent cases.

Deputy Chief Police Officer Shakeshaft said progress was being made with both murders, but was unable to release details for fear of compromising the cases.

''We've had two homicides in close proximity to each other, and it's an exceptionally rare thing for the ACT to have that,'' he said.

''We have two dedicated taskforces who are doing a very thorough investigation of both of these homicides.''

Police are still urging anyone with information to contact Crime Stoppers on 1800 333 000 or via the website.