Questions over the possibility that two of the jurors in the Aaron Brady trial may have visited Crossmaglen after the court case "needed clarification" Brady's lawyers told the last day of his appeal hearing.
Brendan Geehan for the DPP, however, said the "long-established rule" that a jury cannot be questioned after their verdict is returned takes precedence.
In 2020, Aaron Brady, formerly of New Road, Crossmaglen was convicted of the murder of Garda Detective Adrian Donohoe by a majority jury verdict and was sentenced to serve a minimum of 40 years in prison.
The 32-year-old began his appeal against his conviction for the capital murder seven days ago.
Today, on the final day of his appeal hearing, lawyers for Brady were seeking leave to include the latest motion as a new ground of appeal.
Senior counsel Michael O'Higgins who represents Brady, today submitted to court that a juror had "a random meeting" with a jury minder when it was relayed that two jury members from Brady's capital murder trial had travelled to Crossmaglen, Co. Armagh.
Mr O'Higgins subsequently arranged to meet the jury minder at the Criminal Courts of Justice Building last year.
During that meeting the minder confirmed that he met a juror in the street approximately six week after Brady's trial and he had told the minder he had gone to Crossmaglen.
The juror did not make clear to the minder when he made the visit north of the border but, it was the jury minder's impression that the visit took place after the trial.
Mr Geehan said there would have to be "some reasonably well founded basis" for the verdict in this case to be looked into.
