Derek Boyd, 31, from Finglas, Dublin, was found guilty of murdering Mark Carroll at Boyd’s home on 9 June 2024, while he was serving the suspended part of a sentence for manslaughter of his sister. The prosecution rejected Boyd’s self-defense claim, characterizing the stabbing as a deliberate, murderous attack after an evening that began with friends drinking together. A Central Criminal Court jury of 11 rejected the defense and returned a unanimous murder verdict after deliberating over several days. Boyd fled Ireland for the UK shortly after the killing, prompting Garda inquiries into his whereabouts. The case also involved an allegation that Carroll’s partner, Megan Rock, was assaulted during the incident, and the pathologist described Carroll’s chest wound as unsurvivable. The verdict underscores the tensions surrounding self-defense claims when an ongoing suspended sentence and a late-night confrontation intersect with lethal violence.