The man found guilty of murdering his pregnant partner, Natalie McNally, will serve a 31-year-prison sentence before he can be considered for release, Belfast Crown Court has heard.Standing in the dock of Laganside Courthouse on Wednesday morning, Stephen McCullagh was told by Judge Patrick Kinney he had committed a “brutal and senseless murder” of “someone you professed to love”.The murder of the Co Armagh woman in her Lurgan home was “cold-blooded and calculated” and McCullagh showed a “determination” to cover his tracks, the judge said. Natalie McNally’s mother wept holding her daughter’s photograph in the packed public gallery behind the dock as the sentence was handed down.McCullagh, wearing a grey T-shirt and grey track suit bottoms, showed no emotion as the judge told him to stand.McNally (32) had been 15 weeks pregnant with McCullagh’s son when she was murdered in December 2022.McCullagh denied the murder but was convicted in a unanimous verdict following a five-week trial earlier this year.He had staged a YouTube live stream of him playing computer games on the night of the murder, which was an “integral” part of his plan of murder her, the judge said.The judge said the staged live stream had been “carefully curated to appear as if it was streaming live and to provide the defendant a carefully-planned complete alibi to the murder”.Kinney said the sentence passed “cannot possibly reflect the value of Natalie’s life, or indeed that of her unborn child, Dean” or meet the family’s sense of “grief and loss”.He told McCullagh: “You planned this murder in remorseless detail. You attacked someone you profess to love in a frenzied assault, which was characterised by its excessive and gratuitous violence.“Despite that frenzy, the killing was cold-blooded and calculated, as evidenced by the extensive planning leading up to the murder and your actions afterwards. Your behaviour towards the McNally family showed your absolute determination to cover your tracks.”As the door closed behind McCullagh, many in the public gallery turned and hugged each other.A sentencing hearing in May was told that McCullagh made “self-contradictory” and “incredible” statements to his probation officer, first insisting he “was convinced that he was not guilty of the murder”.The probation officer further noted McCullagh described the murder as “evil” and “vicious”, and referred to himself as “a monster”, the court heard.[ How YouTuber Stephen McCullagh tried to get away with the murder of Natalie McNallyOpens in new window ]He also said: “I’m sorry for what I did to that poor family, what I did to Natalie.”He added: “I would take it back if I could.”