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 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?
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?
17-year-old Jodie Chesney was out with friends in an East London park when she was stabbed by unknown assailants. Fatally, it was a case of mistaken identity.