A clever child from a loving home, William Cornick shocked Britain when he stabbed to death his teacher, Ann Maguire, in 2014. What caused his pathological hatred?
In 2009, Rosalyn Hunt and Desmond Thorpe were murdered by teenager Lorraine Thorpe and her accomplice. Was Britain's youngest double female killer always destined to kill?
15-year-old James Fairweather terrorised a local community with random deadly attacks that left two people dead. What made him carry out such brutal murders?
Teenage lovers Kim Edwards and Lucas Markham were convicted of murdering her mum, Elizabeth and younger sister, Katie in April 2016. What led them to kill?
16-year-old Joshua Davies was sentenced to 14 years in jail for the murder of his on-off girlfriend, Rebecca Aylward. Why did he kill her - and why did he only confess to it in prison after his conviction?
In 2013, Sean McHugh, went to a laundrette in Anfield, Liverpool to do his washing, only to be stabbed by a teenage gang. What made them kill an innocent man?
