The jury in the Detective Garda Adrian Donohoe murder trial has been told to put emotion and sympathy for the deceased officer to one side.
Yesterday morning at the Central Criminal Court, Mr Justice Michael White said there were matters that he wanted to draw the jury's attention to.
He said that it was clear from the opening that this is a complex and difficult case, where "human sympathy with the deceased garda officer is very high" on their minds.
Mr Justice White said he wanted to, from a legal point of view, make the jury's function very clear.
"When you are acting as judges you have to put emotion aside, you have to put any sympathy aside," he told the jury of eight men and seven women.
Mr Justice White said that there "is a man here on trial for capital murder" and that the jury must "put any human emotion or sympathy out of your minds".
Aaron Brady (28) is charged with the murder of Det Gda Adrian Donohoe, who was then a member of An Garda Siochana acting in the course of his duty, at the Lordship Credit Union in Bellurgan, Co Louth, on January 25, 2013.
Mr Brady is also charged with the robbery of around €7,000 in cash and assorted cheques from Mr Pat Bellew at the same location on the same date.
The accused, of New Road, Crossmaglen, Co Armagh, has pleaded not guilty to both charges.
In the afternoon the jury was taken through several maps of areas in Co Louth and Co Armagh, which included credit union branches on the Carlingford peninsula and other locations across the counties. Det Gda Laura Bolger, of the Garda Mapping Section at Harcourt Square, said she attended the scene of a fatal shooting at Lordship Credit Union, Co Louth, on January 25, 2013.
The witness told the court that she attended the scene in order to provide maps and to set the scene to assist the court.
Det Gda Bolger said she served there over the next three days, and also assisted members of the garda Technical Bureau.
As the investigation progressed, Det Gda Bolger said, she was requested to map additional locations.
Several maps were shown to the jury displaying various locations in Co Louth and Co Armagh.
The trial will continue before Mr Justice White at the Central Criminal Court this morning.