A second man has been arrested in connection with the investigation into the murder of Ashling Murphy.
The 23-year-old was laid to rest yesterday.
Gardaí have arrested a man in his 30s for potentially withholding information relating to the investigation into the murder.
He is being questioned at a garda station in the eastern region.
Another man who was arrested yesterday on suspicion of murdering the school teacher remains in garda custody at Tullamore garda station.
He had been in hospital since last Thursday, getting treatment on self-inflicted stab wounds and other injuries.
Today marks a week to the day since the 23-year-old went for a run along the canal bank in Tullamore and was violently assaulted.