Leah Green investigates the case of teenagers Hatice Can and Oluwakemi Ajose, who were convicted of the manslaughter of Rosimeiri Boxall in 2009.

Leah Green examines the case of 14-year-old Breck Bednar, who was groomed online by Lewis Daynes, before being murdered in Essex by the 18-year-old.

Schoolboy William Cornick stabbed his teacher Ann Maguire seven times in the back in front of his classmates, and then calmly sat down again saying 'Good times'.

Karate instructor Tony Bushby tricked promising art student Katy Wynter into going out with him by using fake Facebook friends and, once he had won her trust, stabbed her to death in a sexually motivated attack.

Leah Green investigates teenage murderer and Yorkshire Ripper obsessed James Fairweather, who at the age of 15 became Britain's youngest serial killer after stabbing two strangers to death and admitting to planning to slay 15 more.