A neonatal nurse who described herself as a “horrible evil person” was found guilty on Friday of murdering 7 newborn babies and trying to kill another six.

The verdict, following a harrowing 10-month trial at Manchester Crown Court, makes Letby Britain’s most prolific serial child killer in modern history, local media said. Lucy Letby, 33 was convicted of killing 5 baby boys and two baby girls at the Countess of Chester hospital and attacking other newborns, often while working night shifts in 2015 and 2016.

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Letby was in her mid-20s when she preyed on highly vulnerable babies between June 2015 and June 2016, often attacking them just moments after their parents or nurses had left their side. Police were finally contacted in 2017 and she was arrested in 2018.

“I killed them on purpose because I’m not good enough to care for them,” said a handwritten note found by police officers who searched her home after she was arrested.