Aaron Brady has been found guilty of the capital murder of Detective Garda Adrian Donohoe by a majority jury verdict at the Central Criminal Court.
The 29-year-old with an address at New Road, Crossmaglen, Co Armagh will be sentenced to the mandatory term for capital murder of 40 years imprisonment.
Brady had denied capital murder and said he had no involvement in the robbery at Lordship Credit Union on January 25th, 2013 that resulted in the detective's death.
On Monday, Brady was found Guilty of taking part in an armed robbery at the premises.
Eleven of the twelve jurors believed he was the one who shot Detective Donohoe from close range during the robbery.
The jury of five men and seven women found him guilty on the robbery charge on Monday and returned today having been told by trial judge Mr Justice Michael White that they could bring a majority verdict if ten of them agreed. The jury found him guilty on the capital murder charge by a majority 11 to one verdict after 20 hours and two minutes spent considering their verdicts.