A man from Northern Ireland arrested in the Republic over the murder of Detective Garda Adrian Donohoe has been released.
The man aged in his 30s and was arrested in the Dundalk area on Monday, April 19.
Gardai confirmed he was held at Dundalk Garda Station under Section 50 of the Criminal Justice Act 2007.
On Monday, April 26, they confirmed he had been released without charge on Sunday saying a file will be prepared for the Director of Public Prosecutions and the investigation continues.
The arrest was the third as part of the investigation into the fatal shooting of the detective outside Lordship credit union, Dundalk, on January 25, 2013.
Detective Garda Donohoe (41) from Lordship, Co Louth was shot dead when masked raiders targeted the credit union
Mr Donohoe was married with two young children.
Conviction for Adrian Donohoe murder 'gave some closure' for the detective's family
He was one of two detectives on late-night duty who were escorting a cash collection at the rural credit union when the robbery took place.
The arrest is a major development in the case and follows the conviction of Aaron Brady (30) for capital murder last year.
The garda's Co Armagh murderer Aaron Brady given legal aid worth over £1.4m
Brady, from Armagh, was convicted following the longest murder trial in the history of the State. He was sentenced to a minimum term of 40-years.
The jury accepted, by majority verdict, that he was the triggerman who shot dead Adrian Donohoe in cold blood over eight years ago.