22. Beverley Allitt
Beverley Allitt worked as a nurse in Lincolnshire, United Kingdom. While working at a hospital, Allitt committed some heinous crimes in the children’s ward and did so for a while before eventually being caught. Allitt killed four children and hurt another 13 children.

Her methods varied. However, she is perhaps best known for overdosing small children with insulin. During her trial, the judge declared her a severe threat to the general public and would likely never be released. Sure enough, she remains locked away at Rampton Secure Hospital today. She has also earned the nickname Angel of Death.
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