Robert O'Connor (32), of Drumgowna, Louth Village, Dundalk, Co Louth, has pleaded not guilty of murder by reason of insanity, or guilty of manslaughter on the basis of diminished responsibility to the triple murder of his mother Louise O'Connor (56), his father Mark O'Connor (54) and his younger brother Evan O'Connor (27) at their home between September 28 and 29 2025, both dates inclusive