Criminology student quizzed lecturers, looked up crimes and triggered alerts before killing Amie Gray in May 2024

Most young people who study criminology at the University of Greenwich in south London do so in the hope of getting a job in the police or perhaps probation or the Prison Service.

But when Nasen Saadi suddenly switched courses and began to study the subject in the autumn of 2023, he did so with a different motive.