The man accused of the murder of Detective Garda Adrian Donohoe gave an "untrue" account of his whereabouts on the night of the fatal shooting, a court has heard.
A Garda inspector told the jury at the Central Criminal Court that he spoke to Aaron Brady (28) and another man the day after the killing and asked them about their movements the previous evening.
Insp John Moroney said their accounts "did not marry" and that there was a "conflict in times" between them.
The jury also heard from counsel for the accused, Michael O'Higgins SC, that Mr Brady later gave a voluntary statement to gardaí and that the previous account given was untrue.
Mr Brady is on trial for the murder of Det Gda Donohoe, who was then a member of An Garda Síochána acting in the course of his duty, at the Lordship Credit Union in Bellurgan, Co Louth, on January 25, 2013.
He is also charged with the robbery of approximately €7,000 in cash and assorted cheques from Pat Bellew at the same location on the same date.
The accused, of New Road in Crossmaglen, Co Armagh, has pleaded not guilty to both charges.
Insp Moroney told the jury he was in charge of a team of around 30 gardaí searching the area near the scene the day after the murder.
The witness said that he observed a BMW car approaching Ballymascanlon roundabout from the direction of Lordship Credit Union with two occupants inside at 12.35pm in the afternoon.
The court was told Insp Moroney recognised the front-seat passenger as the accused and, at the time, was the prosecuting garda in a matter before Dundalk Circuit Court involving Mr Brady.
The witness said he spoke to Mr Brady away from the car and that he asked him about his movements on the Friday evening, January 25.
Insp Moroney was told by Mr Brady that he was with the driver of the BMW between 4pm and 5pm at a fast-food restaurant in Crossmaglen, Co Armagh.
The accused then told him that he went to his girlfriend's house on Concession Road, Cullaville, about 7pm and stayed there until 3am the following day.
Mr Brady said he was collected by his friend, the BMW driver who cannot be named by court order, and they then returned to a property in Bellurgan where they played the Fifa video game.
The accused, the court heard, told Insp Moroney that he wasn't aware of the murder of Det Gda Donohoe until he woke up on Saturday morning, January 26.
The trial continues before Justice Michael White and the jury of eight men and seven women on Monday morning.