The mummified body found under a pile of debris in the living room of a dead hoarder's home in an affluent northern Sydney suburb was a middle-aged man.
Cleaners sent to clear out the Greenwich property on Greendale Street made the gruesome discovery on Tuesday.
A preliminary post-mortem examination has now revealed it was a man in his 30s or 40s, with the body showing "a number of injuries", Acting Superintendent Simon Jones told reporters in Sydney on Friday.
His cause of death is not yet known, but Supt Jones said it was "unnatural" and "very suspicious".
The homeowner, identified as Bruce Roberts, has been described as a loner and hoarder, who died at the ramshackle property in July last year. His death is not considered suspicious.
But police say they can't rule out that he knew the body was in his home or was involved in his death.
Police on Thursday said the body had been in the house for a "considerable" amount of time and was badly decomposed. The property was being cleaned up to deal with Mr Roberts' will.
Dog squad and detectives remained at the house on Friday and numerous items have been seized - including clothing from the body.
Long-time neighbour Gayle Meagher recalled exchanging pleasantries with the man.
"He was a bit of a recluse," she told the ABC on Thursday.