Gardai have launched a murder investigation following the findings of a post-mortem examination on a pensioner found in a pool of blood at his Cork home.
The death of Joe O'Callaghan (66) at his home off Galway's Lane, Douglas, Cork, is now being treated as murder.
For operational reasons, detectives have refused to release the results of the post-mortem examination on Mr O'Callaghan's body, which was carried out at Cork University Hospital yesterday by Assistant State Pathologist Dr Margaret Bolster.
However, it is understood to have found that the pensioner met a violent death early on Monday. One source indicated the 66-year-old father-of-three had sustained severe head injuries.
A 22-year-old man, who was arrested over the circumstances in which Mr O'Callaghan was found dead, was last night released without charge and a file has been prepared for the Director of Public Prosecutions (DPP).
The suspect presented himself voluntarily at Togher Garda Station a few hours after Mr O'Callaghan's body was found by his wife, Angeline.
The young man was known to Mr O'Callaghan.
He was questioned under Section Four of the Criminal Justice Act.
The DPP has been briefed on the preliminary findings of the post-mortem.
One garda source described the investigation into Mr O'Callaghan's death as "extremely sensitive and quite complex".
Gardai said they were "very pleased" with the information obtained from neighbours and friends of Mr O'Callaghan.
Detectives are continuing to trawl through CCTV security camera footage to determine movements to and from the Galway's Lane area.
The body of Mr O'Callaghan, who was originally from Grange in Cork, was discovered in his bungalow at 8am on Monday.
Nothing appeared to be missing from the property.
However, there were indications that the front door had been forced.
The pensioner was lying in a pool of blood in the hallway.