A 44-year-old Queensland man has been charged over the murder of disability pensioner Robert Duffy.
Police arrested the Cairns man at a Port Douglas address on Thursday and he was charged later in the afternoon.
They refused to confirm he was Mr Duffy's carer, but Detective Inspector Geoff Marsh told reporters he was located in one of two cars belonging to Mr Duffy that police had appealed for help in locating on Wednesday.
A white 2000 Mercedes Benz station wagon was located in Cairns on Wednesday night following a public tip-off, while the 44-year-old man was found driving Mr Duffy's 2004 Holden Commodore.
He will front Cairns Magistrates Court on Friday.
The body of Mr Duffy, 62, was found at his Mooroobool home on Monday shortly after his ex-wife, who hadn't heard from him in three days, raised the alarm.
Det Insp Marsh wouldn't comment on how Mr Duffy had died but said a pathologist had deemed his death to be homicide.
"His injuries were sufficient for the pathologist to make a finding of homicide," he said.
Det Insp Marsh said police were not looking for any other people in the matter at this stage.