From nerd to cold killer: colleague of murderer Stephen McCullagh speaks out about monster he thought he knew

When Conall McMeekin worked the night shift at the Belfast Telegraph he formed a close bond with the small team who worked through the night - alone together in the empty old building.Amongst them was a quiet geek called Stephen McCullagh, who loved gaming, dressing up for Comic Con and sipping on energy drinks through the night.Years later, a very different McCullagh would stand in the dock accused of the brutal and planned murder of pregnant Natalie McNally - a case which has stunned Northern...