The Lucy Letby case, a shocking murder trial involving a nurse accused of killing babies, has an unexpected twist. But here's where it gets controversial: a key expert witness, Professor Peter Hindmarsh, was under scrutiny himself during the trial.
The General Medical Council (GMC) launched an investigation into Hindmarsh's fitness to practise medicine, citing concerns about patient harm, on the very day he testified against Letby in late 2022. This investigation remained open when Hindmarsh took the stand again three months later. Great Ormond Street Hospital had reported him to the GMC after their own inquiry, led by University College London Hospitals Trust (UCLH), his main employer.
The jury, unaware of this investigation, convicted Letby of murdering babies in the neonatal unit of Countess of Chester Hospital. During the trial, a medical tribunal restricted Hindmarsh's work, stating he posed a potential risk to the public. Yet, he was still allowed to testify as an expert witness for the prosecution.
The GMC investigation never reached a conclusion. Hindmarsh voluntarily removed himself from the GMC register, effectively ending the inquiry. The Guardian uncovered details of the allegations against him at the time of his testimony.
Letby's case is now a subject of intense debate. She was sentenced to 15 whole-life terms for murdering seven babies and attempting to murder seven others in two trials. She maintains her innocence, and many supporters believe she was made a scapegoat for medical failures. Dozens of medical and scientific experts argue that the prosecution's medical evidence, including Hindmarsh's testimony, was flawed.
Dr. Shoo Lee, a renowned neonatologist, led a 14-member expert panel that unanimously found the babies died of natural causes and poor care, with no evidence of murder or insulin poisoning. This panel's findings have been submitted to the Criminal Cases Review Commission (CCRC) to re-examine Letby's case.
Hindmarsh, a pediatric endocrinologist, testified twice in Letby's first trial, considered Britain's longest murder trial. He claimed babies F and L were poisoned with insulin, supporting the prosecution's case. However, the jury was unaware of the allegations against Hindmarsh at UCLH and Great Ormond Street Hospital, which could have impacted his credibility.
The GMC and UCLH investigations revealed concerns about patient harm, diagnosis, treatment, and documentation. Despite this, Hindmarsh was allowed to continue as an expert witness, provided he disclosed the investigation to those instructing him. The prosecution only informed Letby's defense about the GMC investigation days before his second testimony.
The insulin evidence presented by Hindmarsh is now contested. Experts argue that the tests used are unreliable and that Hindmarsh's calculations and the prosecution's theory are flawed. They believe the babies' hypoglycemia was due to poor medical care, not insulin poisoning.
This case raises important questions about expert witness reliability and the impact of undisclosed investigations on trial outcomes. Should Hindmarsh's testimony have been allowed, given the ongoing GMC investigation? And what does this mean for Letby's conviction? The debate continues, with many calling for a re-examination of the evidence and the role of expert witnesses in such high-stakes trials.
