Lawyers acting for Lucy Letby are seeking permission from the Court of Appeal for a fresh challenge against her convictions.
The disgraced nurse is serving a rare whole-life sentence for murdering seven babies and trying to kill seven others while working as a neo-natal nurse at the Countess of Chester Hospital.
She was convicted in August 2023 and was refused permission to appeal against the convictions in May 2024.
Speaking at a press conference in London on Monday, barrister Mark McDonald said: “The primary grounds of appeal at the previous hearings related to the admissibility before the jury of the evidence of the lead prosecution expert Dr Dewi Evans.
“The defence argued twice at trial that Dr Evans’ evidence should be disregarded. This was refused by the trial judge.
“It was then later argued in the Court of Appeal, and was refused in the court of appeal.
“Remarkably, Dr Evans has now changed his mind on the cause of death of three of the babies: Baby C, Baby I and Baby P.”
Lucy Letby is serving 15 whole-life orders (PA Media)
Mr McDonald continued: “Dr Evans had said to the jury that Lucy Letby had injected air down a nasal gastric tube and this had led to the death of the three babies.
“This was repeated to the Court of Appeal, who may have been misled when they ruled on the application for leave against the convictions.
“Dr Evans has also said that he has revised his opinion in relation to Baby C and has written a new report, a new report that he has given to the police, months ago now.
“Despite numerous requests, the prosecution has yet to give this report to the defence.
“The defence will argue that Dr Evans is not a reliable expert, and given that he was the lead expert for the prosecution, we say that all the convictions are not safe.”
He spoke alongside Dr Richard Taylor, a neonatologist from Victoria, British Columbia, Dr Roger Norwich, a consultant paediatrician, and Peter Elston, who is a statistician.