A killer has starred in a gangster rap video from behind bars, the grieving mother of his victim has claimed.

Zoey McGill believes Calum Maddison, who was 15 when he knifed her son Jack Woodley in the back, is the rapper in a short film uploaded to TikTok.

Mobile phones are strictly prohibited in young offenders' institutions and she thinks Maddison, who is serving life for murder, recorded and shared it on the social media platform using a contraband device.

Ms McGill, 37, from Newton Aycliffe, County Durham, said: 'He is rapping about being big and hard and how he is a gangster.

'He stabbed a boy to death. This is serious. He thinks what he has done is so cool.