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 comicon 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 Ireland.

So what was McCullagh really like and were there any signs of what was to come.

Nicola and Niall talk to Conall about night shifts with a killer.

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