A child killer calmly told police how he had taken another youngster to the scene of his heinous crime just days before savagely murdering Nikki Allan.
Footage of David Boyd being interviewed by police showed him described helping a boy get through a window into the derelict building where he would go on to murder the seven-year-old schoolgirl.
In the clips, released after he was found guilty of smashing Nikki's head with a brick before repeatedly plunging a knife into her chest, he sounds calm although his leg can be seen bouncing nervously under a table at times.
