Thousands of messages reveal how teenagers plotted murder of Brianna Ghey

Defendants seemed to take delight in discussing gruesome ways of killing - but why they targeted Brianna remains unclear

One killer called the other a sociopath"; while her partner-in-crime said she was not a normal person" who would joke about dead babies".

Despite this, or perhaps because of it, the girl and boy who murdered Brianna Ghey were firm friends, having met at school aged 11.