The YouTube Deception: How a Streamer’s Fake Alibi Failed to Save Him from a Murder Conviction

Stephen McCullagh appeared to have constructed an unbreakable shield against prosecution for the murder of his pregnant partner, Natalie McNally. His defense rested on a single, seemingly irrefutable fact: at the precise moment of her death, he was broadcasting live on YouTube. However, this digital alibi crumbled weeks later when investigators revealed the stream was not real-time footage, but a pre-recorded fabrication.

During a police interview, an investigator dismantled McCullagh’s confidence, stating flatly, “That wasn’t live.” When McCullagh insisted the video could be verified on YouTube, the detective countered with proof that the broadcast had been manipulated. This revelation marked the end of McCullagh’s elaborate attempt to evade justice. On Wednesday, the 36-year-old from Woodland Gardens in Lisburn was sentenced for Natalie’s murder, receiving a minimum term of 31 years before parole eligibility.

The conviction follows a five-week trial held earlier this year. Natalie McNally was 15 weeks pregnant when she was killed in her Lurgan residence in December 2022. McCullagh was initially arrested at the scene after claiming to have discovered her body. However, he was released because his YouTube stream provided him with a credible alibi.

It took six weeks for cyber experts to expose the deception. Investigators confirmed that McCullagh had secretly recorded a six-hour gaming session and played it back as a live stream. This ruse provided him with the necessary cover to travel from Lisburn to Lurgan in disguise, commit the murder, and return home before the video concluded. Throughout this period, he maintained the charade by sending texts inquiring about Natalie’s well-being and later making a dramatic 999 call upon “finding” her body.

Immediately after the call, McCullagh began shifting blame toward Natalie’s ex-boyfriend. According to Police Service of Northern Ireland (PSNI) senior investigating officer Neil McGuinness, McCullagh was “very confident of avoiding justice.” He adopted the persona of a grieving victim, performing this role for his friends, the McNally family, and the public in Lurgan. He was, McGuinness noted, “very close to getting away with murder.”

The police had originally accepted the alibi because YouTube, the platform hosting the stream, confirmed it had been broadcast as a live event. Consequently, McCullagh was “de-suspected.” He then assumed the role of the heartbroken partner, attending Natalie’s wake, visiting her grave, and creating a memorial video for a vigil. All the while, he was covertly recording his interactions with the McNally family, hoping to gather intelligence on the investigation.

As the inquiry stalled, police explored other leads and suspects, sifting through vast amounts of CCTV footage amid growing public concern that an indiscriminate killer was at large. Pressure mounted on investigators from the press, the public, and the victim’s family.

“Those were 15-hour days, for six weeks with no rest days,” DCI McGuinness recalled. “Most of my team didn’t take any time off. They didn’t see their families. They were there from morning to night.” Upon taking over the case, McGuinness made a direct promise to the McNally family: “I would literally work to exhaustion to try to bring them justice.”

The breakthrough finally came from a specific hunch. Investigators were looking for a suspect leaving the development where Natalie was killed, specifically someone carrying a dark-colored rucksack.

“I remember it clear as day,” McGuinness said. On a Saturday afternoon, an officer contacted him, saying almost apologetically, “This might be nothing, but I think I have something for you.” The officer had reviewed footage showing a man with his face obscured boarding a bus bound for Lurgan in Dunmurry. The man was holding a green “bag for life,” inside which appeared to be a dark rucksack. The individual’s stature matched that of the person seen on CCTV at the crime scene and bore a resemblance to Stephen McCullagh.

With this new evidence, the dynamic of the investigation shifted. As one officer reportedly told his colleagues, “Sit down, we’ve got him.” The PSNI then began a comprehensive review of all available intelligence linking McCullagh to the crime.

Source: BBC News Generated at: 2026-06-03 10:30:20 UTC