Experts — conflict map

Main contribution: Provided the principal medical-causation narrative across the indictment, diagnosing air embolism, exogenous insulin and gastric-air administration as mechanisms of harm.

Key claim: Skin-discolouration patterns and gas findings were diagnostic of deliberate harm via intravenous air, insulin administration and air-in-stomach.

Criticism: Methodology rejected by the 14-member Shoo Lee International Expert Panel (Feb 2025). Lee himself states the prosecution misapplied his 1989 paper. A family court judge separately described an unrelated Evans expert report as 'worthless' (2023). Self-referred to Cheshire Police; out of routine NICU practice for over a decade at the time of trial.

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Main contribution: Largely corroborated Dr Evans's conclusions at trial.

Key claim: Supported the air-embolism and insulin theories advanced by Dr Evans.

Criticism: The defence case at trial, recorded in the Court of Appeal judgment, was that she and Dr Evans 'applied skin discolouration as a means of diagnosing air embolus outside any reliable basis for doing so'. The Court of Appeal refused leave on that ground, holding it was not arguable. The February 2025 International Expert Panel, reviewing the same material, reached natural-cause conclusions in the cases at issue.

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Main contribution: Re-read original autopsy material on behalf of the Crown.

Key claim: Identified pathology findings the Crown argued were consistent with the deliberate-harm mechanisms.

Criticism: The Court of Appeal judgment records that he was one of the experts instructed after, and on the advice of, Dr Evans, which post-conviction critics say makes his findings a second opinion built on the first rather than independent corroboration of it. The February 2025 International Expert Panel, reviewing the same post-mortem material, attributed the deaths it examined to natural causes or to failures of care.

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Main contribution: Gave post-mortem radiology evidence for the Crown.

Key claim: Radiological findings were consistent with the prosecution's mechanisms (intravascular gas, air-in-stomach).

Criticism: The Court of Appeal judgment records that he was one of the experts instructed after, and on the advice of, Dr Evans. The February 2025 International Expert Panel re-examined the imaging in the indicted cases and reported that it found no evidence of air embolism, attributing the collapses to natural causes or to failures of care.

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Main contribution: Endocrinology evidence on the two insulin counts (Babies F and L) at the 2022–2023 trial.

Key claim: Low insulin-to-C-peptide ratios were diagnostic of exogenous insulin administration.

Criticism: The GMC opened a fitness-to-practise investigation into Hindmarsh on the same day he began giving evidence at the Letby trial in late 2022; the medical tribunal concluded the allegations 'may have the potential to impact on his ability to act as an expert witness' but the jury was never told. Hindmarsh removed himself from the GMC register through voluntary erasure on 14 November 2024, ending the investigation without a regulatory finding. Independent clinical biochemists (Ismail, Chase, Senn) have separately argued the Roche immunoassay used at trial was not forensically validated and that confirmatory mass spectrometry was not performed.

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Main contribution: Instructed as the neonatology expert for Letby's defence at trial, attending nearly every day of proceedings and writing a detailed report on the medical evidence. He was not called to give evidence and the jury never heard his opinion; he told the Guardian he did not know why he was not called.

Key claim: Hall told the Guardian: "With regard to the medical evidence, I don't think the prosecution proved she was guilty beyond reasonable doubt. I don't think she had a fair trial because no medical expert witness was called for the defence to challenge the prosecution expert medical evidence." He also said prosecution witnesses had exaggerated how unwell some of the babies were.

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Main contribution: Convened and chaired the 14-member International Expert Panel, whose summary report (published February 2025) reviewed the medical evidence for all 17 trial counts. Lee is also senior author of the 1989 paper on pulmonary vascular air embolism in newborns that prosecution witnesses cited at trial; he has since said using it to support the claim that air was injected into the babies' veins was "a categorical error".

Key claim: The Panel he chaired found "no medical evidence to support malfeasance causing death or injury" in any of the 17 cases, concluding the deaths and injuries were due to natural causes or errors in medical care, alongside problems with teamwork at the unit. Lee has also said none of the skin discolorations described by prosecution witnesses matched the single sign his 1989 paper identified as diagnostic of air embolism.

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Main contribution: UK-based member of the International Expert Panel that reviewed the medical evidence for all 17 trial counts. The Panel's own report identifies her as Professor of Neonatal Medicine at Imperial College London and a past president of the Royal College of Paediatrics and Child Health, and states that her involvement was "as an individual, and not representative of any organisation or institution".

Key claim: As a Panel member, Modi took part in the group's conclusion that there was "no medical evidence to support malfeasance causing death or injury" in any of the 17 cases reviewed, and that the deaths and injuries were attributable to natural causes or errors in medical care rather than to deliberate harm.

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Main contribution: Swedish member of the International Expert Panel. The Panel's own report identifies him as professor of paediatrics and neonatal medicine at the Karolinska Institutet and director of the Swedish Neonatal Quality Register, the author of over 270 scientific papers on newborn cardiovascular physiology, preterm-birth outcomes and patient safety.

Key claim: As a Panel member, Norman took part in the group's conclusion that there was "no medical evidence to support malfeasance causing death or injury" in any of the 17 trial cases reviewed, with the deaths and injuries instead attributed to natural causes or errors in medical care on the unit.

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Main contribution: Canadian member of the International Expert Panel. The Panel's own report identifies him as Pediatrician-in-Chief at Mount Sinai Hospital, Toronto, a professor at the University of Toronto, and director of the Canadian Preterm Birth Network and the international iNeo network, which benchmarks outcomes for very preterm babies across 240 neonatal units in 13 countries.

Key claim: As a Panel member, Shah took part in the group's conclusion that there was "no medical evidence to support malfeasance causing death or injury" in any of the 17 trial cases reviewed, with the deaths and injuries instead attributed to natural causes or errors in medical care on the unit.

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Main contribution: German member of the International Expert Panel. The Panel's own report identifies him as a professor of neonatology who has led neonatal divisions in Ulm and Marburg and at Sidra Medicine in Qatar, with a research focus on neonatal lung injury, mechanical ventilation and reducing brain-bleed rates, and more than 150 published articles.

Key claim: As a Panel member, Hummler took part in the group's conclusion that there was "no medical evidence to support malfeasance causing death or injury" in any of the 17 trial cases reviewed, with the deaths and injuries instead attributed to natural causes or errors in medical care on the unit.

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Main contribution: Retired consultant in clinical biochemistry, and co-author with six other specialists of a joint expert witness report on Babies F and L. Told BBC Radio 4's File on Four that the Roche immunoassay used at trial can produce "misleading results" and that he would not forward such a result to clinical colleagues without a confirmatory test to verify its "velocity and integrity".

Key claim: The joint report Ismail co-authored concluded the jury was misled: insulin autoantibodies can produce falsely high immunoassay results and can cross the placenta to cause apparent hyperinsulinism in newborns, the Liverpool laboratory's testing did not meet forensic standards, and no confirmatory mass-spectrometry test was carried out before the results were relied on in court.

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Main contribution: Physiological-modelling specialist, University of Canterbury, New Zealand. With chemical engineer Helen Shannon, published a peer-reviewed paper in the Journal of Diabetes, Science and Technology (reported December 2024) arguing that a large share of preterm babies show high insulin readings and that insulin-binding antibodies are a common, non-criminal explanation for the pattern seen at trial.

Key claim: Chase and Shannon argue the insulin doses alleged at trial are not physiologically plausible: for Baby L, they say the administration method proposed by the prosecution would have needed 20 to 80 times more insulin than it could deliver. Chase told the BBC the 'impossible' result described by the prosecution 'is effectively quite common' in preterm infants.

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Main contribution: Credited on this site with a plain-English analysis of why the insulin evidence fails a forensic standard. UNVERIFIED: we have not been able to source this. The page previously placed her at science4justice.nl; that site is Foundation Science for Justice NL, associated with Prof. Richard Gill, and her name does not appear on it. The affiliation has been removed and the rest of this entry needs checking or the entry removing.

Key claim: Roche Cobas manufacturer guidance, the 2010/2012 Liverpool lab protocol change, false-positive literature, and sample-handling failures undermine the forensic use of the assay.

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Main contribution: Retired Royal Navy diving-medicine consultant. Air-embolism mechanism specialist with operational hyperbaric experience.

Key claim: The volumes, vascular access points and time-course alleged at trial are not consistent with the operational physiology of intravenous air embolism in a preterm infant.

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Main contribution: Case-by-case clinical analysis of Children A/B, C, D, O and P, with attention to obstetric history.

Key claim: Per-case clinical record supports natural-cause readings for the cases analysed.

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Main contribution: Pseudomonas/sewage and infection-control angle on the unit's documented environmental issues.

Key claim: Documented infection-control failures on the unit during the indictment period are part of the natural-cause differential.

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Main contribution: Shaken Baby Syndrome miscarriage-of-justice profile. Independent paediatric-neuropathology perspective on disputed post-mortem inferences.

Key claim: Forensic over-attribution of trauma findings to single mechanisms is a recurring problem in paediatric pathology and applies to the Letby record.

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Main contribution: NHS consultant neonatologist who also sits on the government-appointed Ockenden review into a separate NHS maternity scandal. The Guardian reported she was one of five clinicians who approached the GMC over evidence given by prosecution witness Dr Dewi Evans, and that she is separately providing an expert report on individual babies for Letby's legal team.

Key claim: Dimitrova told the Guardian: "the theories proposed in court were not plausible and the prosecution was full of medical inaccuracies." She added: "I wasn't there, so I can't say Letby was innocent, but I can see no proof of guilt," while noting that, like Roger Norwich, she had not had access to the full clinical notes used at trial.

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Main contribution: Chemical engineer and independent consultant. With Prof. Geoff Chase, co-authored a peer-reviewed paper in the Journal of Diabetes, Science and Technology and a case-specific bioengineering analysis of the insulin evidence against Letby for Babies 6 and 12, circulated alongside the International Expert Panel's material submitted to Letby's legal team.

Key claim: Shannon and Chase's analysis states that the insulin dose required under the prosecution's theory of administration was far higher than the alleged method could deliver, putting the shortfall for Baby L at 20 to 80 times, and that C-peptide and potassium levels in both babies were not suppressed in the way exogenous insulin poisoning would be expected to produce.

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Main contribution: Emeritus Professor of Forensic Psychology, King's College London. Author of the canonical scholarly work on false confessions; gave evidence in the appeals of the Guildford Four, Birmingham Six, Stefan Kiszko, Judith Ward, Derek Bentley and Sally Clark. Creator of the Gudjonsson Suggestibility Scale.

Key claim: Interviewed Lucy Letby twice in summer 2025 and produced a report addressing the psychology of the handwritten notes found at her home, applying the established literature on self-blame writing by individuals under sustained institutional accusation.

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Main contribution: Programme lead of Applied Criminology and Forensic Psychology at Edinburgh Napier University. Featured in the Channel 5 documentaries 'Lucy Letby: Did She Really Do It?' (October 2024) and 'Lucy Letby: The New Evidence' on the psychology of the handwritten notes and clinician-under-investigation framing.

Key claim: The handwritten notes reflect extreme mental distress in an experienced and trusted nurse under sustained accusation; not forensic confession.

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Main contribution: Flagship UK EBM voice. Sustained public commentary applying the EBM framework to the Letby evidence.

Key claim: The Crown's medical methodology does not meet EBM standards.

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Main contribution: Author of Bad Science and Bad Pharma. Framework for identifying unreliable medical claims applied to the Letby evidence.

Key claim: The Crown's medical case displays features the Bad Science framework would flag as unreliable.

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Main contribution: Emeritus professor of mathematical statistics at Leiden University, Gill led the statistical campaign that overturned the 2003 conviction of Dutch nurse Lucia de Berk. He co-authored the Royal Statistical Society's September 2022 working-party report on statistical pitfalls in investigating suspected medical murder, and runs a Dutch foundation, LucyLetby.org, dedicated to disseminating scientific critique of the case. Cheshire Police warned him during the trial that his blogging was in 'serious and flagrant' contempt of court.

Key claim: Gill told the Justice Gap in 2024: 'I think that the trial was unfair, the police investigation was unfair and, I also say, I'm certain Lucy Letby is innocent.' In a February 2025 blog post he set out a Bayesian argument, estimating prior odds of roughly 50 to 1 that a spike in neonatal deaths reflects poor hospital care rather than a serial killer.

Criticism: Cheshire Police wrote to Gill during the trial stating that his online commentary was in 'serious and flagrant' contempt of court and had come to the attention of the trial judge; Gill published the warning on his own website and said it had not changed his view of the case.

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Main contribution: Professor of Risk Information Management at Queen Mary University of London and a director of the risk-modelling company Agena, Fenton writes the blog Probability and Risk with colleague Martin Neil. In an August 2023 post he raised concerns about the shift-rota chart used at trial, interviewed a researcher critical of the case, and linked it to concerns Richard Gill had also raised about how the case had been investigated.

Key claim: Fenton's post referenced a video he had previously made on the general statistical fallacy of inferring guilt from a nurse's presence during a cluster of unusual events, made in relation to the earlier Ben Geen case, and said this issue was 'relevant' to the reasoning behind the Letby shift-chart. He did not present a full probability calculation for the Letby case in the post.

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Main contribution: In April 2018, Cheshire Police approached Professor Jane Hutton of Warwick University and asked her to calculate the probability of one nurse being on duty for all the deaths and collapses under investigation. According to an account given by David Davis MP in the House of Commons on 8 January 2025, police signed a consultancy agreement with her before telling her in 2021 that prosecutors had instructed them not to pursue the statistical question further.

Key claim: Davis told MPs that Hutton advised police the question was wrongly framed: a proper statistical inquiry should not concentrate on one pre-identified staff member, but should investigate all possible explanations for the unit's collapses, including medical conditions, prematurity and the unit's broader performance, before focusing on an individual. He said the jury that convicted Letby was never told of this advice.

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Main contribution: Cambridge statistician and former RSS president Sir David Spiegelhalter gave a formal witness statement to the Thirlwall Inquiry, dated 15 January 2025, analysing whether existing statistical-monitoring systems would have flagged the 2015-16 rise in neonatal deaths at the Countess of Chester Hospital. He examined the unit's data through the MBRRACE-UK and CQC outlier-detection frameworks and carried out his own statistical calculation using the unit's historical death counts.

Key claim: Spiegelhalter concluded the unit's neonatal mortality rate was higher than average in 2015 and 2016 but not a 'clear outlier' compared with other units, and that the CQC's system did not flag it at the time. His own calculation, using 2010-14 death counts, put the probability of the 2015 total occurring by chance at around 0.008 to 0.02 - enough to trigger a monitoring 'alert' nationally about once a year by chance alone, but not proof of a cause.

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Main contribution: Emeritus Professor of Statistics at Bristol and a past president of the Royal Statistical Society, Green chaired the RSS working party that produced 'Healthcare serial killer or coincidence?' (September 2022), a general report on statistical pitfalls in investigating suspected medical murder, published before Letby's trial concluded. In July 2024 he was one of 24 signatories, alongside Jane Hutton and Stephen Senn, to a private letter urging ministers to postpone or broaden the Thirlwall Inquiry's terms of reference.

Key claim: The 2022 report, which does not name Letby, set out general risks in investigating suspected serial medical harm, including treating coincidence as proof of guilt and investigative bias once a suspect is identified. The 2024 letter he signed argued the inquiry's narrow remit risked 'a failure in understanding and examining alternative, potentially complex causes for the deaths' and asked for further investigation before the inquiry proceeded on the assumption of murder.

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Main contribution: Schneps is an American mathematician and, with her daughter Coralie Colmez, co-author of 'Math on Trial: How Numbers Get Used and Abused in the Courtroom' (2013), which examines ten historical cases where mathematical fallacies contributed to wrongful convictions, including Sally Clark's, where a paediatrician wrongly treated two cot deaths as independent events to produce a one-in-73-million figure. The book predates Letby's trial by a decade and does not discuss her case.

Key claim: The book's central argument is that courts and juries can misjudge coincidence, mistaking rare-but-expected events for evidence of deliberate wrongdoing. The Royal Statistical Society's 2022 working-party report on statistical issues in investigating suspected medical misconduct cites the book's Sally Clark chapter as background reading on this type of reasoning error; the report does not apply Schneps's analysis to Letby's case specifically.

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Main contribution: An honorary professor in the department of statistical science at UCL, O'Quigley told the Justice Gap in 2024 that the prosecution's shift-rota chart relied on what he calls the 'lottery fallacy' - treating a seemingly rare pattern as proof of wrongdoing without checking its probability under an innocent explanation. He argued the chart only showed that when the suspected nurse was on duty, she was on duty, since incidents were partly defined by her presence.

Key claim: O'Quigley told the Justice Gap: 'Any statistician - a first year undergraduate in statistics - could show that's nonsense... you really don't need a sophisticated understanding of statistics to see that it is a complete crock.' Asked if he was certain Letby is innocent, he said: 'I cannot be certain that she's innocent. I can be certain that she did not get a fair trial... that chart evidence is a crock.'

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Main contribution: Senn, formerly head of health statistics at the University of Glasgow, was one of 24 signatories to a private letter sent to the health and justice secretaries in July 2024, seen by the Guardian, calling for the Thirlwall Inquiry into the Countess of Chester deaths to be postponed or have its terms of reference changed. The signatories, mostly doctors, nurses and scientists, said they were not associated with Letby or her defence.

Key claim: The letter argued the inquiry's narrow terms of reference risked a 'failure in understanding and examining alternative, potentially complex causes for the deaths', so that 'possible negligent deaths that were presumed to be murders' could be missed, and asked for a pause 'to allow for further investigation and to hear wider professional concerns' rather than proceeding on an assumption of guilt.

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Main contribution: Lord Sumption, a Justice of the Supreme Court from 2012 to 2018, was reported in late March 2025 as saying he had reviewed the case and concluded there were 'serious anomalies' casting doubt on the safety of Letby's convictions, despite what he called an 'impeccable' summing up by the trial judge and a Court of Appeal that had 'meticulously examined the evidence' before refusing permission to appeal.

Key claim: He was quoted as saying the prosecution's theories of how Letby attacked her victims 'seem very speculative', that the case against her was 'circumstantial', and that those questioning the convictions - 'many lawyers and scientists' - are 'too numerous and too well qualified to be dismissed as troublemakers'. His reported conclusion: 'On the material presently available, I believe Lucy Letby was probably innocent.'

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Main contribution: Career miscarriage-of-justice silk (Birmingham Six, Guildford Four, Hillsborough). Public commentary since 2023 identifying the Letby case as a miscarriage in the making.

Key claim: The Letby case displays the structural features of previous English miscarriages of justice.

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Main contribution: Senior UK barrister; career focus on miscarriages of justice and systemic prejudice against women defendants.

Key claim: The procedural and evidential framework of the Letby case warrants the CCRC review.

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Main contribution: Human-rights barrister; commentary on expert-evidence standards and CCRC referral mechanics.

Key claim: Expert-evidence standards required for serial-attribution prosecutions were not met.

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Main contribution: Co-editor of the canonical UK academic reference works on miscarriages of justice.

Key claim: The October 2025 supplementary CCRC submissions operationalise the established miscarriage-of-justice framework.

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Main contribution: Medico-legal expert with an interest in paediatrics and newborn medicine. The Guardian reported he filed formal GMC complaints about both prosecution expert witnesses, Dr Dewi Evans and Dr Sandie Bohin, arguing their trial evidence did not meet the standard expected of an impartial expert witness. He told the Guardian he had not received a response from the GMC.

Key claim: Norwich told the Guardian he believed both Evans and Bohin "had failed to provide balanced, impartial views, instead giving the court opinions that would not be supported by most doctors." He acknowledged, like Svilena Dimitrova, that he did not have access to the full clinical notes used at trial.

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Main contribution: Long-running miscarriage-of-justice campaigner. Public engagement with the Letby case post-Panel.

Key claim: The Letby record warrants the same disciplined re-examination as previous miscarriage-of-justice cases.

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Main contribution: Consultant neonatologist, qualified 1988 and a Fellow of the RCPCH from 1998. As clinical lead for the regional neonatal network he chaired its Clinical Effectiveness Group and sat on the Neonatal Steering Group. He gave evidence to the Thirlwall Inquiry on 20 November 2024 about what the network knew of the rise in deaths at the Countess of Chester and what it did about it.

Key claim: The Clinical Effectiveness Group existed to learn from reviews rather than to monitor death rates, and the network did not treat mortality figures as a surveillance signal. In his witness statement he accepted that 'the overall role and performance of the locality network in relation to monitoring and oversight of neonatal mortality in 2015/16 could have been improved'.

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Main contribution: Consultant neonatologist and, since 2017, Medical Director at the Royal Free London NHS Foundation Trust. She carried out the casenote review that accompanied the 2016 RCPCH review of the Countess of Chester neonatal unit, examining the deaths and near-misses in the period. Her name was put forward as an independent person and, as she told the Inquiry, expressly not on behalf of the RCPCH.

Key claim: Her review was a casenote review and could only work from what it was given. Asked whether such a review is 'a fairly superficial exercise', she answered: 'That is correct. It is only based on the information that's provided.' She was not told that a member of staff was suspected, and told the Inquiry that had the purpose been to exclude deliberate harm, a casenote review would not have been the right instrument.

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Main contribution: Neonatal nurse and the nursing member of the RCPCH invited review team that examined the Countess of Chester neonatal unit in 2016. She gave evidence to the Thirlwall Inquiry on 11 November 2024 on two statements, the second addressing later work developing a framework for BAPM, and opened by correcting her own account of the review team's discussions about police involvement.

Key claim: She rejected the suggestion that the review team had been steered away from a police referral. Put to her that the team was being urged to find something, she said she did not agree and that 'We would find what we found' — 'Which was the truth.' Asked whether the executives were treating the allegations seriously and recognised their seriousness, she answered: 'No.'

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Main contribution: In September 2022, before Letby's trial concluded, the RSS's Statistics and the Law Section published a general working-party report, 'Healthcare serial killer or coincidence?', chaired by Peter Green with contributions from Richard Gill and Jane Hutton. The Society wrote to the Thirlwall Inquiry in September and November 2023 recommending its terms of reference include the appropriate use of statistical monitoring data in neonatal settings.

Key claim: In a July 2024 statement, the RSS said it was 'aware of concerns raised by some RSS members and the wider statistical community around the statistical aspects of the Lucy Letby case' and that its 2022 report 'highlighted the challenges of interpreting statistical evidence in medical murder cases'. It said it would convene a meeting on implementing the report's recommendations; it has not itself issued a finding on the safety of Letby's conviction.

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Main contribution: The Royal College of Paediatrics and Child Health conducted an invited review of the Countess of Chester neonatal unit in November 2016, after the trust raised concerns about rising deaths. According to an account given in the House of Commons, the review identified inadequate staffing, delayed escalation of concerns to tertiary units, and a 'disconnection between the neonatal leadership and the trust's governance and risk management processes' as issues that could explain the deaths.

Key claim: The review was a casenote review commissioned to examine clinical care, not to investigate deliberate harm; the reviewer, Dr Jane Hawdon, told the Thirlwall Inquiry it was 'a fairly superficial exercise... only based on the information that's provided' and that she was not told a staff member was under suspicion. According to David Davis MP, the review's findings on staffing and escalation were not shown to the jury at trial.

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