Michael Whittam’s death continues to baffle detectives more than a week after his body was found at his Mossley home.
And they are urging residents to help them piece together the final hours of his life.
Mr Whittam’s property at 29 Moorlands Drive has been searched on a daily basis by forensic experts since his body was discovered on the morning of March 30. They were only scheduled to leave on Friday, April 8.
A Home Office post mortem examination discovered the 59-year-old, who lived on his own, died from a head injury.
But the coroner was unable to decide if the wound was an accident or something more sinister.
Detective Inspector Richard Ennis is treating Mr Whitlam’s death as suspicious and officers have been stationed at the front and also at the rear of the house where its garden backs onto Huddersfield Road.
Residents have described seeing multiple police personnel and vehicles since the drama unfolded.
At the time of going to press, however, there were no suspects and no major leads to solve the latest mystery to rock the area.
Oldham detectives have spent four months trying to identify a pensioner, nicknamed Neil Dovestone, found two miles away on a track leading to Chew Reservoir in Greenfield.
In Mossley DI Ennis is still pursuing reports of an argument at 10.10pm on March 29, possibly involving two people, coming from the direction of Mr Whittam’s property.
Neighbours spoken to by the Correspondent can’t recall any disturbances involving a man they describe as a “private” person.
A Police spokesman said: “We have been told a witness heard arguing. If so, who was arguing?
“We want to trace people who were heard arguing and identify them. It may be this arguing actually took place in a nearby property or on the street.
“If you have any information, no matter how trivial you think it may be, please contact officers at Ashton police station on 0161 856 9262 or contact Crimestoppers anonymously on 0800 555 111.”