He was questioned in the Laois Garda Station yesterday.
Aaron Brady, the man who killed Detective Garda Adrian Donohoe, has been released back into prison following his arrest yesterday.
The 29 year old was detained on suspicion of witness intimidation, perverting the course of justice and the unlawful use of a mobile phone in prison, in connection with his trial.
He was released without charge this morning and Gardai say investigations are ongoing.
Aaron Brady was sentenced to life in prison in October for the murder of Detective Garda Donohoe in 2013.
GlowDepot The New Late Night City In The Woods For Electric Picnic
Fishtown Reveals Lineup For Electric Picnic
Gardaí Attend Scene Of Three Vehicle Crash
Colin Farrell Rumoured To Be Part Of Star Filled Production In Offaly
Offaly Athletics Club Pushing To Raise €400k For New Olympic Sized Track
Offaly Community Hopeful Of Town Hall Reopening By 2030
Hospital Parking Charges Rise By Over €10m
Road Haulage Association Calls For Fuel Support Extension