Case No. 0461Impeding prosecution · Co. Dublin · 9 Jun 2024
Charges dropped against Chantelle Harcourt, partner of double killer Derek Boyd
Derek Boyd, 31, fatally stabbed Mark Carroll, 34, a father-of-four, in the chest with a kitchen knife at his north Dublin home in Finglas on 9 June 2024, after an argument during an evening of drinking and cocaine use. Boyd, who was serving the suspended part of his sentence for the 2022 manslaughter of his sister Sandra Boyd, fled to Scotland by ferry and later pleaded not guilty to murder. A Central Criminal Court jury found Boyd guilty of murder in July 2026 and he was sentenced to mandatory life imprisonment on 28 July 2026. His partner Chantelle Harcourt, 34, was charged with impeding his prosecution by making a false statement to gardai, but after a hung jury the DPP dropped all charges against her and no re-trial will be pursued.
- Reportednot reported
- Arrestednot reported
- Chargednot reported
- In courtnot reported
- Convicted22 Jul
- Sentenced28 Jul
4 reports
reportedhappened, not reportedlatest stagenot yet
Key facts
consolidated from all reports- What happened
- Derek Boyd, 31, fatally stabbed Mark Carroll, 34, a father-of-four, in the chest with a kitchen knife at Scribblestown Place, Finglas, Dublin 11 on 9 June 2024, after an argument during an evening of drinking and cocaine use.
- Carroll died from a stab wound to the chest measuring around 10.5cm in depth; the pathologist noted minor injuries consistent with being in a fight.
- Boyd was serving the suspended part of his sentence for the 2022 manslaughter of his sister Sandra Boyd, whose death resulted from an accidental discharge of an unlawfully held firearm.
- Boyd fled to Scotland by ferry about nine hours after the killing; the murder weapon was never recovered.
- Charges
- Chantelle Harcourt, 34, was accused of impeding Boyd's prosecution by making a false statement to gardai at Blanchardstown Garda Station on 9 June 2024.
- In court
- A Central Criminal Court jury found Boyd guilty of murder after nearly nine hours of deliberation, unanimously rejecting his self-defence argument, and was unable to reach a verdict on the impeding prosecution charge against Harcourt.
- The judge described the killing as senseless and motiveless and an act of anger; a nolle prosequi was entered on the assault causing harm count against Boyd.
- The DPP dropped all charges against Harcourt and entered a nolle prosequi, discharging her from the indictment with no re-trial to be pursued.
- Sentence
- Boyd was sentenced to mandatory life imprisonment on 28 July 2026, with his sentence dating from 5 August 2025; his suspended manslaughter sentence for his sister was to be referred back to the Circuit Court.
- Other details
- Boyd had 18 previous convictions and was not known to have any employment history; he and Carroll were known to each other through a family connection but not closely.
88 statements extracted from the articles
- whatBoyd fatally stabbed Carroll in the chest at his north Dublin home on 9 June 2024. (irishtimes.com)
- whatCarroll had minor injuries consistent with being in a fight. (irishtimes.com)
- whatMark Carroll died from a stab wound to the chest measuring around 10.5cm in depth (dublinlive.ie)
- whatMark Carroll was a father-of-four from Finglas who had also lived in Ashbourne, Co Meath, and Co Monaghan (dublinlive.ie)
- whatSandra Boyd's death resulted from an accidental discharge of the unlawfully held firearm (dublinlive.ie)
- whatThe four of them consumed cocaine that evening. (irishmirror.ie)
- whatBoyd pulled Megan Rock by the hair to the ground after stabbing Mark. (irishmirror.ie)
- whatMark Carroll was frantically knocking on doors in the neighbourhood looking for help before collapsing. (irishmirror.ie)
- whatBoyd took a ferry to Scotland about nine hours after the killing. (irishmirror.ie)
- whatBoyd fled the jurisdiction after the stabbing, saying he panicked and did not know the seriousness of Mark's condition. (irishmirror.ie)
- whatBoyd was still under active supervision in terms of the suspended sentence at the time of Mark Carroll's death. (irishmirror.ie)
- whatMark Carroll had no previous convictions. (irishmirror.ie)
- whatAaron Brady, 35, formerly of Crossmaglen, Co Armagh, was convicted of the murder of Detective Garda Adrian Donohoe during a credit union robbery at Lordship, Bellurgan, Co Louth on January 25, 2013. (irishmirror.ie)
- whatIn 2024, Brady pleaded guilty to video-recording a witness interview between Ronan Flynn and members of An Garda Síochána between February 20 and May 7, 2020. (irishmirror.ie)
- whatA further count of conspiring with Dean Byrne to persuade prosecution witness Daniel Cahill not to give evidence between April 8, 2020 and June 22, 2020 was taken into account. (irishmirror.ie)
- whatRonan Flynn told gardai he heard Brady admit to shooting Detective Garda Adrian Donohoe three times while they shared an apartment in New York. (irishmirror.ie)
- whatThe video was posted on social media accusing Flynn of touting and calling him a rat. (irishmirror.ie)
- whatMr Justice Michael White described the release of the footage as the most outrageous contempt of court and a clear attempt to intimidate Flynn and other witnesses. (irishmirror.ie)
- whatDean Byrne, 33, from Cabra Park, Phibsborough, Dublin, was found guilty of conspiring with Brady to persuade Daniel Cahill not to give evidence. (irishmirror.ie)
- whatByrne has over 120 convictions and was sentenced to two years for the conspiracy offence. (irishmirror.ie)
- whatDaniel Cahill told the jury that Brady admitted to shooting a garda on three occasions while living in New York. (irishmirror.ie)
- whatFlynn said that when Brady was drunk he would listen to the Wolfe Tones and say things like 'Sure f**k it, I shot a guard'. (irishmirror.ie)
- whatDerek Boyd, 31, fatally stabbed Mark Carroll, 34, a father of four. (irishmirror.ie)
- whereBoyd had an address at Scribblestown Place, Finglas, Dublin 11. (irishtimes.com)
- whereThe murder took place at Scribblestown Place, Finglas, Dublin 11. (irishtimes.com)
- whereThe four people drank in Boyd's garden at Scribblestown Place in Finglas on the evening of 8 June 2024. (irishmirror.ie)
- whereSandra Boyd died in the kitchen of the family home. (irishmirror.ie)
- whereChantelle Harcourt had lived at The Salvation Army in Coolock for the past two years. (irishmirror.ie)
- whereChantelle Harcourt, 34, is from Primrose Grove, Darndale, Dublin 17. (irishmirror.ie)
- whereDerek Boyd's address is Scribblestown Place, Finglas, Dublin 11. (irishmirror.ie)
- whenA solicitor acting for Boyd contacted gardaí on 2 August 2025 to say Boyd wished to present himself. (irishmirror.ie)
- whenBoyd made a statement at Finglas Garda Station on 5 August 2025 claiming self-defence. (irishmirror.ie)
- whenBoyd pleaded guilty to the manslaughter of his sister Sandra Boyd on 7 October 2022. (irishmirror.ie)
- whenThe alleged false statement was made on 9 June 2024 at Blanchardstown Garda Station. (irishmirror.ie)
- causeCarroll died from a stab wound to the chest measuring around 10.5cm in depth, which was unsurvivable. (irishtimes.com)
- causeCarroll died from a stab wound to the chest measuring around 10.5cm in depth. (irishtimes.com)
- causeSandra Boyd's death happened as a result of a reckless or negligent discharge of a gun. (irishmirror.ie)
- weaponBoyd grabbed a kitchen knife and used it during a struggle with Mark Carroll. (irishmirror.ie)
- chargeBoyd pleaded not guilty to murdering Carroll. (irishtimes.com)
- chargeHarcourt was accused of impeding Boyd's prosecution by making a false statement to gardaí. (irishmirror.ie)
- courtA Central Criminal Court jury found Derek Boyd guilty of murdering Mark Carroll. (irishtimes.com)
- courtThe 11 jurors were unable to reach a verdict on the assault charge against Boyd and the impeding prosecution charge against Harcourt. (irishtimes.com)
- courtBoyd was remanded in custody until 28 July. (irishtimes.com)
- courtHarcourt was remanded on continuing bail until the next list to fix dates at the Central Criminal Court on 30 July. (irishtimes.com)
- courtThe jury took nearly nine hours to find Boyd guilty of murder (dublinlive.ie)
- courtThe jury unanimously accepted that self-defence was not open to the accused (dublinlive.ie)
- courtThe judge described the killing as senseless and motiveless and an act of anger (dublinlive.ie)
- courtA nolle prosequi was entered on the count of assault causing harm against Boyd (dublinlive.ie)
- courtMark Carroll's 2022 assault charge came before Dublin Circuit Court in 2024 and was withdrawn after his death. (irishmirror.ie)
- courtBrady was sentenced to three years in prison by the three-judge, non-jury Special Criminal Court. (irishmirror.ie)
- courtThe Supreme Court is to hear Byrne's challenge against the Court of Appeal's decision to uphold his conviction. (irishmirror.ie)
- courtThe court identified two errors in the original sentencing: excessive emphasis on the lack of violence and failure to attach sufficient weight to general deterrence. (irishmirror.ie)
- courtThe DPP dropped all charges against Chantelle Harcourt and will not pursue a re-trial. (irishmirror.ie)
- courtAfter a three-week trial, the 11 jurors were unable to reach a verdict on the single count. (irishmirror.ie)
- courtA nolle prosequi was entered on the single charge and Harcourt was discharged from the indictment. (irishmirror.ie)
- sentenceThe judge will hand down the mandatory sentence of life imprisonment to Boyd on 28 July. (irishtimes.com)
- sentenceThe judge ordered Boyd's suspended manslaughter sentence to be referred back to the Circuit Court. (irishtimes.com)
- sentenceBoyd was sentenced to mandatory life imprisonment for murder (dublinlive.ie)
- sentenceThe sentence dates from 5 August 2025 when Boyd went into custody (dublinlive.ie)
- sentenceBoyd was given a four-year sentence with the final two years suspended for the manslaughter of his sister (dublinlive.ie)
- sentenceA concurrent five-year sentence with the final three years suspended was given for the firearm and ammunition offences (dublinlive.ie)
- sentenceThe two-year sentence was backdated to 21 March 2022 (dublinlive.ie)
- sentenceDerek Boyd was jailed for life for murdering Mark Carroll at his north Dublin home. (irishmirror.ie)
- sentenceBoyd's manslaughter sentence for his sister will be referred back to the Circuit Court. (irishmirror.ie)
- sentenceBoyd was given a four-year sentence with the final two years suspended for the manslaughter. (irishmirror.ie)
- sentenceBoyd received a concurrent five-year sentence with the final three years suspended for the firearm and ammunition offences. (irishmirror.ie)
- sentenceBrady is serving a life sentence with a minimum of 40 years for the murder and was also jailed for 14 years for the robbery. (irishmirror.ie)
- sentenceThe court set a new headline sentence of nine years, reduced to six and a half years after mitigation, then reduced by 18 months under the totality principle, leaving a final term of five years. (irishmirror.ie)
- sentenceBoyd was jailed for life earlier that week. (irishmirror.ie)
- sentenceBoyd was given the mandatory term of life imprisonment for the murder of Mark Carroll. (irishmirror.ie)
- sentenceBoyd's sentence for the manslaughter of his sister Sandra four years ago would be referred back to the Circuit Court. (irishmirror.ie)
- otherBoyd was serving the suspended part of his sentence for the manslaughter of his sister at the time of the killing. (irishtimes.com)
- otherBoyd fled the jurisdiction by boarding a ferry from Belfast to Scotland hours after the killing. (irishtimes.com, dublinlive.ie)
- otherThe murder weapon was never recovered. (irishtimes.com, dublinlive.ie)
- otherBoyd had pleaded not guilty to murdering Carroll. (irishtimes.com)
- otherCarroll was from Finglas but had lived in Ashbourne, Co Meath, and Co Monaghan. (irishtimes.com)
- otherCarroll had pleaded guilty to assault causing harm to his girlfriend. (irishtimes.com)
- otherAt the time of his death, Carroll was awaiting trial on a second charge of assault causing harm. (irishtimes.com)
- otherThe pathologist said Carroll had minor injuries consistent with being in a fight. (irishtimes.com)
- otherBoyd told gardai he had taken the knife with him from the house (dublinlive.ie)
- otherBoyd has 18 previous convictions (dublinlive.ie)
- otherBoyd is the only boy in a family of eight children with seven sisters (dublinlive.ie)
- otherAt the time of the murder Boyd had two children but now had a third (dublinlive.ie)
- otherBoyd was not known to have any employment history (dublinlive.ie)
- otherBoyd and Carroll were known to each other through a family connection but not closely (dublinlive.ie)
- otherBoyd was serving the suspended part of his sentence for killing his sister at the time of the murder. (irishmirror.ie)
- otherCCTV supported Harcourt's assertion that she was upstairs for the seven-minute period when the fatal stabbing took place. (irishmirror.ie)
- otherForensic scientist Dr Alan McGee noted at least four blood-stained ring patterns on the kitchen floor that were likely altered by wiping. (irishmirror.ie)
The reporting
newest first- 1 Aug2026No-retrial and all charges dropped against partner of double killer Derek Boyd
DPP entered nolle prosequi and discharged Harcourt from the indictment after a hung jury at the Central Criminal Court; Boyd was sentenced to life for the murder of Mark Carroll the same week.
accused, Chantelle Harcourt, 34, female, named, irish (judged from name)Chantelle Harcourtconvicted, Derek Boyd, 31, male, named, irish (judged from name)Derek Boydvictim, Mark Carroll, 34, male, irish (judged from name)Mark Carrollvictim, Sandra, female, irish (judged from name)Sandra - 31 Jul2026Garda murderer's 'contempt' for trial lands him with increased sentence
Court of Appeal increased Brady's perverting the course of justice sentence from three to five years, finding the original sentence unduly lenient and failing to give sufficient weight to general deterrence. Dean Byrne's two-year sentence for the related conspiracy was also discussed, with his case heading to the Supreme Court.
convicted, Aaron Brady, 35, male, named, non-irish (judged from name)Aaron Bradyvictim, Adrian Donohoe, male, irish (judged from name)Adrian Donohoeconvicted, Dean Byrne, 33, male, named, irish (judged from name)Dean Byrne - 29 Jul2026'Unpardonable sin': How the murder trial of double killer Derek Boyd unfolded
Detailed account of the murder trial including witness testimony from Megan Rock, Boyd's self-defence statement, evidence of his flight to Scotland, and the life sentence imposed. Also details the background of the 2022 manslaughter of Sandra Boyd.
convicted, Derek Boyd, 31, male, named, irish (judged from name)Derek Boydvictim, Mark Carroll, male, irish (judged from name)Mark Carrollvictim, Sandra Boyd, female, irish (judged from name)Sandra Boydaccused, Chantelle Harcourt, female, named, irish (judged from name)Chantelle Harcourt - 28 Jul2026'Monster' jailed for life for murder of man in north Dublin
Boyd received mandatory life imprisonment for the murder of Mark Carroll; the judge described the killing as 'senseless and motiveless' and 'an act of anger'. His suspended sentence for the manslaughter of his sister Sandra Boyd was to be referred back to the Circuit Court. The nolle prosequi was entered on the assault causing harm count against Boyd.
victim, Mark Carroll, 34, male, irish (judged from name)Mark Carrollconvicted, Derek Boyd, 31, male, named, irish (judged from name)Derek Boydvictim, Sandra Boyd, female, irish (judged from name)Sandra Boydaccused, Chantelle Harcourt, 34, female, named, irish (judged from name)Chantelle Harcourt - 28 Jul2026Derek Boyd jailed for life for ‘senseless and motiveless’ murder of man at his home
Reports Boyd's sentencing to mandatory life imprisonment, the jury's nine-hour deliberation, the judge's description of the killing as 'senseless and motiveless', and the order to refer his suspended manslaughter sentence back to the Circuit Court.
victim, Mark Carroll, 34, male, irish (judged from name)Mark Carrollconvicted, Derek Boyd, 31, male, named, irish (judged from name)Derek Boydvictim, Sandra Boyd, female, irish (judged from name)Sandra Boyd - 22 Jul2026Derek Boyd found guilty of murdering man at his Dublin home in 2024
The jury unanimously convicted Boyd of murder after eight hours and 51 minutes over three days, rejecting his self-defence argument. He was remanded in custody pending a mandatory life sentence on 28 July 2026. The jury was unable to reach a verdict on the assault causing harm charge against Boyd and the impeding prosecution charge against Chantelle Harcourt, who was remanded on continuing bail until 30 July 2026.
convicted, Derek Boyd, 31, male, named, irish (judged from name)Derek Boydvictim, Mark Carroll, 34, male, irish (judged from name)Mark Carrollvictim, Sandra Boyd, female, irish (judged from name)Sandra Boydsuspect, Chantelle Harcourt, 34, female, named, irish (judged from name)Chantelle Harcourtvictim, Megan Rock, female, irish (judged from name)Megan Rock