UPDATE: Police say it's likely a man found in a unit in Maryborough on Tuesday died of non-suspicious causes.
Acting Detective Senior Sergeant David Guild said it appeared the man, believed to be aged in his 50s, had died overnight.
"Police have been called to the scene here today responding to a QAS call," he said.
"At this stage, we are just making enquiries in relation to a deceased person at this address.
"Our indications at this stage is that it is a non-suspicious matter."
Act Det Snr Sgt Guild said police would investigate further depending on the result of the autopsy.
He said police had carried out crime scene work because it was a deceased senior male who was found alone and who hadn't been identified.
Act Det Snr Sgt Guild said there was no sign of forced entry or any violence at the unit and, at this stage, it was unclear how the man had died.
EARLIER UPDATE: A woman who lives next door to a Maryborough unit where a man died, possibly under suspicious circumstances, has said she heard nothing on Tuesday morning before an ambulance was called to the address.
The body of the man was removed from the unit on Lennox St in Maryborough just before 3pm.
Letitia Cameron said she slept in until about 9.30am and she hadn't noticed anything was amiss until emergency services arrived at the address next to her house, opposite the Brolga Theatre.
Ms Cameron said she had not known the people who lived in the unit where the man, aged about 63, was found but she believed they had only been living at the address for about six to eight weeks.
She said she had seen them coming and going occasionally.
When asked if it felt unusual to be living next to a potential crime scene, Ms Cameron said about two years ago she had experienced something similar when another neighbour died.
That man died of natural causes and Ms Cameron said it remained to be seen what this man's cause of death had been.
EARLIER: Police are investigating the possible suspicious death of a man, aged about 63, in Maryborough's Lennox St.
A police spokesman said officers were called to the scene by the Queensland Ambulance Service about 11.20am on Tuesday.
He said detectives and scenes of crime officers were trying to establish whether it was a suspicious death or not.
It's believed the man's body is still inside the block of units.