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Huckle, from Ashford, Kent, had been serving 22 life sentences after admitting the sexual abuse of up to 200 Malaysian children aged between six months and 12 years.

The Prisons and Probation Ombudsman said there were "missed opportunities" to identify an increased risk of serious violence leading up to Huckle's death.

Fitzgerald, who was jailed for 34 years for Huckle's murder, had spoken to prison staff about his "extremely violent fantasies".

Richard Huckle, 33, died after a 78-minute attack by Paul Fitzgerald, 30, in his cell in October 2019.

In 1949, three scientists — biomedical scientist John Franklin Enders, virologist Frederick Chapman Robbins, and virologist Thomas Huckle Weller — learned how to grow poliovirus in the laboratory.