Thousands of messages reveal how teenagers plotted murder of Brianna Ghey

Brianna Ghey was murdered by Girl X and Boy Y, both of whom were 15 at the time, in February this year. Photograph: Supplied

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.