Father of triple murder accused died of 44 stab wounds, court hears

Chief State Pathologist tells trial there were no obvious defence injuries on Mark or Louise O'Connor

By LineZotpaper

Published20 October 2026

Read Time3 min

The father of triple murder accused Robert O'Connor died after suffering 44 stab wounds in what the Chief State Pathologist described as a sustained and violent attack at the family home in Co Louth, the Central Criminal Court has heard. His wife Louise was stabbed at least 20 times, the court was told.

A forensic pathologist has told the Central Criminal Court that Mark O'Connor died of 44 stab wounds and his wife Louise was stabbed at least 20 times during an attack at their home in Drumgowna, Louth Village, Dundalk, Co Louth, between 28 and 29 September 2025.

Robert O'Connor, aged 32, has pleaded not guilty to the murder of his mother Louise, 56, his father Mark, 54, and his younger brother Evan, 27, by reason of insanity, or guilty of manslaughter on the basis of diminished responsibility. The jury has been told that the accused accepts he caused the deaths of the three victims.

Chief State Pathologist Linda Mulligan, giving evidence for the prosecution, said she conducted post-mortem examinations on Mark and Louise O'Connor on 1 October 2025. She said Mark's body was found near the entrance gate to the house, Evan's body near the patio doors wearing only shorts, and Louise's fully clothed in the kitchen. Three knives were recovered from the scene.

Prof Mulligan said Mark O'Connor had been stabbed 44 times, with the majority of wounds over the back, head and neck. The deepest wound track was 20cm, penetrating into the scapula. There was no evidence of defence-type wounds on his arms or forearms, and the pathologist said the 44 stab wounds and seven incised wounds suggested "a sustained and violent attack". Death occurred from blood loss and respiratory compromise arising from the multiple stab wounds.

Louise O'Connor had been stabbed at least 20 times, including ten wounds to the head, neck, chest and abdomen, two to the left arm and eight to the back and back of the neck. The deepest wound was 18cm, and three wounds to her shoulder blade, rib and upper back were inflicted with severe force. Prof Mulligan said no obvious defence injuries were identified, and death would have occurred rapidly from blood loss and lung collapse after the multiple stab wounds.

In both cases, the injuries showed one squared and one blunted end, indicating a single sharp-edged blade, the pathologist said.

The trial continues before Mr Justice Mícheál P O'Higgins and a jury of six men and six women, who will next hear the post-mortem evidence relating to Evan O'Connor.

Analysis

Why This Matters

The evidence goes to the central question of the trial: the accused accepts he caused the deaths, so the case turns on his mental state at the time and the nature of the attack.
The pathologist's finding that neither parent showed defensive wounds may be weighed by both sides as the insanity and diminished responsibility pleas are tested.
The verdict will determine whether Robert O'Connor is convicted of murder, manslaughter, or is found not guilty by reason of insanity.

Background

Robert O'Connor, 32, faces three charges over the deaths of his mother Louise, 56, his father Mark, 54, and his brother Evan, 27, at the family home in Co Louth on 28-29 September 2025. He has accepted causing the deaths but has pleaded not guilty to murder by reason of insanity, or alternatively guilty of manslaughter on the basis of diminished responsibility. The prosecution's case is being built through expert and forensic evidence, with the court this week hearing detailed post-mortem findings.

Key Perspectives

Prosecution: The evidence presented by the Chief State Pathologist depicts a sustained and violent attack in which both parents suffered repeated stab wounds, with no apparent defensive injuries, pointing to the severity of the assault. Defence: The pleas entered frame the accused's position: he accepts the deaths but argues he should not be convicted of murder owing to insanity or diminished responsibility. The jury is yet to hear the psychiatric evidence supporting that case. The court: Mr Justice Mícheál P O'Higgins and the jury must weigh the medical evidence now being heard against the mental-state evidence still to come, with the post-mortem findings on Evan O'Connor yet to be presented.

What to Watch

The post-mortem evidence on Evan O'Connor, expected next in the trial.
Psychiatric testimony on the accused's mental state at the time of the attack, central to the insanity and diminished responsibility pleas.
The jury's verdict, likely to turn on whether the defence establishes diminished responsibility or insanity.

Sources

Father stabbed 44 times, mother stabbed 20 times - court · RTÉ News

Checked

12 claims in this story checked against 1 source: 10 supported.

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SupportedThe Chief State Pathologist called the attack on Mark O'Connor “a sustained and violent attack.”RTÉ News: “The expert witness said the 44 stab wounds and seven incised wounds suggested "a sustained and violent attack".”
SupportedMark O'Connor died after suffering 44 stab wounds.RTÉ News: “The father of triple murder accused Robert O'Connor died after suffering 44 stab wounds”
SupportedThe pathologist said Mark O'Connor had no evidence of defence-type wounds on his arms or forearms.RTÉ News: “There was no evidence of defence-type incised wounds on Mark's arms or forearms.”
SupportedThe pathologist said Louise O'Connor had no obvious defence injuries.RTÉ News: “She said no obvious defence injuries were identified.”
SupportedLouise O'Connor was stabbed at least 20 times.RTÉ News: “Prof Mulligan said Louise had been stabbed at least 20 times”
Partly supportedThe pathologist described the attack on Mark as sustained and violent.RTÉ News: “The expert witness said the 44 stab wounds and seven incised wounds suggested "a sustained and violent attack".”
Partly supportedMark and Louise's injuries showed one squared and one blunted end, indicating a single sharp-edged blade.RTÉ News: “In both cases, Prof Mulligan said many of the injuries showed one squared and one blunted end, indicating that the blade of the knife used was a single, sharp-edged weapon.”
SupportedRobert O'Connor, aged 32, pleaded not guilty to the murders by reason of insanity, or guilty of manslaughter on the basis of diminished responsibility.RTÉ News: “Robert O'Connor, aged 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”
SupportedThe accused accepts he caused the deaths of the three victims.RTÉ News: “The Central Criminal Court jury have been told that the accused accepts he caused the death of the three victims.”
SupportedThe pathologist conducted post-mortem examinations on Mark and Louise on 1 October 2025.RTÉ News: “Chief State Pathologist Linda Mulligan today told Róisín Lacey SC, prosecuting, that she conducted a post-mortem examination on Mark and Louise O'Connor's remains on 1 October 2025.”
SupportedMark and Louise were killed at their home between 28 and 29 September 2025.RTÉ News: “at their home between 28-29 September 2025.”
SupportedThree knives were recovered from the scene.RTÉ News: “The witness said three knives were recovered from the scene.”