Lawyers for the State insist Brian Meehan's lawyers were given access to all the evidence gathered ahead of his trial for the murder of Veronica Guerin.
The 48-year-old, who is from Crumlin in Dublin, is trying to have his conviction declared a miscarriage of justice.
During Meehan's trial, Marian Finnegan was able to place Russell Warren on the steps of Naas Courthouse on June 26th 1996 - the day Veronica Guerin was shot dead.
Her evidence corroborated Mr Warren's testimony that he was sent there to monitor the journalist's movements.
He said he was in constant phone contact with notorious criminal John Gilligan and Mr Meehan, who was convicted of murder after he was found to be the driver of the motorbike used in her assassination.
During Mr Gilligan's trial in 2001, it emerged Ms Finnegan was unable to identify Russell Warren in a garda line up.
Meehan's defence claims this is a "new and crucial piece of evidence" that should render his conviction a miscarriage of justice.
They have also raised concerns about phone evidence and the absence of certain witnesses during Meehan's trial.
Lawyers for the Director of Public Prosecutions (DPP) disagree, and insist all of their statements were made available to the original legal team.
