The teen who murdered Ava White told a police officer "shut up you nonce" when questioned about the killing.
Ava, 12, was knifed in the neck by a 14-year-old boy in an argument over him filming her on Snapchat. A trial heard Boy A, who cannot be named for legal reasons, smirked and laughed afterwards, then ran away and ditched his flick knife, designer coat and mobile phone in a "cover up".
The killer - accused of showing a "callous disregard" for the schoolgirl - took selfies, got butter for crumpets and played Call of Duty at a friend's flat while Ava was dying. When phoned by his mum and told detectives were looking for him, he hung up, then texted her: "Gonna end up going the cells for nothing."
