Prisoner convicted of murder for fatal attack on fellow inmate in Mountjoy prison

David Dunne, 40, was convicted of murder for killing fellow inmate Robert O'Connor at Mountjoy prison. A jury found that Dunne lured O'Connor into his cell before attacking him, resulting in fatal injuries. Dunne had claimed self-defense, stating O'Connor attacked him first. However, evidence, including CCTV footage, contradicted his account, showing a coordinated assault involving other prisoners. Dunne will receive a life sentence on December 16. O'Connor died from severe head injuries, with a pathologist confirming the trauma was consistent with stamping.