Convicted murderer Joe O'Reilly was treated in hospital last night after he was injured in a prison volleyball game.
O'Reilly, who is serving a life sentence for murdering his wife Rachel, is currently housed at Arbour Hill prison in Dublin's north inner city.
Independent.ie has learned that O'Reilly (43) was playing volleyball with fellow inmates at the prison last night when the accident took place.
A source said: "Joe O'Reilly went up for a ball and so did this other inmate. O'Reilly's head collided with the other inmates elbow.
"It was a total accident and there is nothing to suggest it was malicious."
The murderer was taken to the Mater Hospital where he received a number of stitches to his mouth before being discharged.
A source said he has not suffered any long-term injuries and an insider said it is not a disciplinary matter.
In July 2007, O'Reilly was found guilty by a Central Criminal Court jury and sentenced to life imprisonment for the murder of his wife.
The badly beaten body of Rachel O'Reilly was found in the bedroom of her home by her mother on October 4, 2004. Before he was charged with the murder, Joe had appeared as a guest on The Late Late Show to talk about her death.
Rachel died due to blunt-force trauma to the head, inhalation of blood, skull fracture and brain contusion.
O'Reilly later lost an appeal against his conviction and, in May 2015, the Court of Appeal refused his application to have his conviction declared a miscarriage of justice.
Lawyers for O'Reilly then applied to the Supreme Court for leave to appeal that decision.
Among various arguments, it was contended the Court of Appeal paid insufficient regard to O'Reilly's argument he did not sufficiently appreciate, at the time of the trial, the significance of the book of evidence, or any portion of it, being found in the jury room.
However, last November, the Supreme Court refused to permit O'Reilly a further appeal.