Four men arrested in connection with the death of a man following an assault in Dublin City Centre have been released without charge.

The 29-year-old man, who has been named as Gareth O'Connor from Clondalkin in Dublin, sustained a serious head injury at Cow's Lane in the Temple Bar area at around 8.45pm on Thursday.

He was brought to St James's Hospital where he later died.

The men arrested at the scene were held at Irishtown, Pearse Street and Kevin Street Garda Stations.

A file will be prepared for the Director of Public Prosecutions.

A post-mortem examination is due to be carried out today on the man’s body.