To get away with murder, Stephen McCullagh planned an audacious alibi: he would trick the world into thinking he was at home livestreaming a video game when in fact he was 17 miles away, extinguishing a life. He prerecorded a six-hour session of him playing Grand Theft Auto and uploaded it on the night of 18 December 2022, to give the impression to his YouTube channel’s 37,000 subscribers that he was at home in Lisburn, County Antrim, wearing a Santa hat, eating snacks, sipping Guinness and making jokes. “I am not leaving the house tonight,” he said. While the recording played, McCullagh donned a disguise and travelled to Lurgan, County Armagh, where he killed his pregnant girlfriend, Natalie McNally, by stab wounds to the neck, strangulation and heavy blows to the head. Prosecutors said it was a “sophisticated, calculated and cool-headed plot” by a man “capable of deception beyond imagination”. A deception, however, that failed, because on Monday a jury of six men and six women convicted McCullagh, 36, of murder. The five-week trial at …