(Article dated 20 February 2026, by Liz Hull, Northern Correspondent)
New medical research has been published which casts serious doubt on claims of an expert panel that child killer
Lucy Letby is innocent and the victim of a miscarriage of justice, the Daily Mail has learned.
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Prof Lee told journalists that his own research into air embolism - air bubbles in the blood – which was the method Letby used to kill - had been misinterpreted by the prosecution at her trial.
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But, the Daily Mail can reveal, new research published by a neonatologist in Taiwan as recently as October appears to contradict this claim.
And at least four other papers on air embolism, published between 1981 and the present day, have been missed, or wrongly interpreted, by Prof Lee, experts say.
The most recent paper, published in the journal Paediatrics and Neonatology last year, examines the case of a 33-week gestation premature baby boy who developed a blotchy purple and pink rash associated with air getting into their venous circulation. [...]
It is understood the paper has also been sent to the CCRC, the body investigating Letby’s case as a potential miscarriage of justice, for consideration.
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Speaking in a personal capacity, and not on behalf of his employers, Prof Clarke told the Daily Mail: ‘In my opinion it is a false dichotomy to claim that venous air embolism could never cause the arterial air embolism skin manifestations, including the supposedly specific but rare so-called ‘Lee sign’. The existence of cases in the literature is proof of this.’
The medic pointed to at least four other pieces of research into air embolism – not just the one published in October – which also appear to have been missed or misinterpreted by Prof Lee, who claims to have carried out two exhaustive reviews of the medical literature into air embolism, first in 1989, then in an updated report in 2024.
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Lucy Letby's defence team say new medical evidence has been submitted to the Criminal Cases Review Commission in a bid to have her convictions quashed.
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