Joseph O'Callaghan's body was discovered on Monday morning
A man being questioned over the death of Joseph O'Callaghan in Cork has been released without charge.
The body of the 66-year-old was discovered on Monday at his home in Douglas.
A forensic examination has been carried out at the scene.
An altercation was overheard at the property the previous night.
A 21-year-old man handed himself into gardaí on Monday afternoon.
The man had been detained at Togher garda station and has been released.
A file will be prepared for the Director of Public Prosecutions (DPP).
Additional reporting: Jack Quann