A man in his 30s has been arrested in connection with the murder of Detective Garda Adrian Donohoe on 25 January 2013.
Gardaí arrested the man in the Dundalk area shortly before 8.30am in relation to the capital murder of the detective.
He is being detained at Dundalk Garda Station.
Det Garda Donohoe was shot dead outside the Lordship Credit Union eight years ago.
Last October, Aaron Brady, of New Road, Crossmaglen in Co Armagh, was sentenced to life in prison for the murder of Det Garda Donohoe.
Brady was also sentenced to 14 years for armed robbery at the Lordship Credit Union.
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