On December 18, 2022, the city of Lurgan in Northern Ireland was shaken by the tragic murder of Natalie McNally, a 32-year-old pregnant woman. Initially, the authorities and the public believed that she had been killed by an unidentified individual driven by a desire to commit a heinous crime. However, as the investigation progressed, it became apparent that the murderer was someone unexpected: the prime suspect with the strongest alibi. In this case, we will delve into the details of Natalie McNally's murder and explore how the killer meticulously constructed an elaborate alibi, only to have it unravelled by the relentless efforts of the investigators.