LONDON — The lawyer for Lucy Letby, a British nurse convicted in the killings, said Monday he plans to ask an appeals court to review her convictions after the prosecution’s main expert changed his mind on the how three babies died.

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Dr. Dewi Evans’ testimony is no longer credible after he reversed his opinion that Letby killed three infants by injecting air into a nasal gastric tube, attorney Mark McDonald said.

“The defense will argue that Dr. Evans is not a reliable expert, and given that he was the prosecution’s lead expert, we say that not all convictions are safe,” McDonald said.

Letby, 34, is serving multiple life sentences with no chance of release after being convicted of murdering seven babies. and attempted to murder seven other people while working as a neonatal nurse at the Countess of Chester Hospital in the northwest of England between June 2015 and June 2016.

The Crown Prosecution Service defended the verdicts.

“Two juries and three Court of Appeal judges considered a multitude of different pieces of evidence against Lucy Letby,” a CPS spokesperson said in a statement. “In May, the Court of Appeal rejected Letby’s leave to appeal on all grounds – rejecting his argument that the prosecution’s expert evidence was flawed.”

Prosecutors said during the trial that the methods Letby used left little trace and included injecting air into their blood, poisoning them with insulin and interfering with breathing tubes. Prosecutors said she represented a “constant malicious presence” and was alone on duty in the neonatal unit when the children collapsed or died.

Letby, who testified at two trials that she had never harmed a child, has maintained her claims of innocence.

Experts said it was unusual to ask the appeals court to reopen its previous decision to dismiss a case and that it would take compelling evidence to win the case.

“It is extremely rare for a key expert witness in a criminal case to ‘change his or her mind’ on key pieces of evidence,” said defense attorney Sean Caulfield, who is not involved in the case . “It is also rare that we attempt to reopen an appeal after it has already been refused by the Court of Appeal. I have never seen these two things happen in unison in my 20 year career. astonishing turn of events. »

McDonald said 15 medical experts from around the world were reviewing the evidence from the trials.

An investigation now underway to examine the hospital’s failure to recognize why the babies were dying and why it took so long to stop Letby opened in September amid a backdrop of experts and others questioning the evidence used against Letby.

A group of scientists, doctors and legal experts who independently reviewed the scientific evidence from Letby’s trial have warned Britain’s health and justice ministers that legal systems are “particularly vulnerable to error” when they dealt with technical issues, “particularly in cases involving statistical anomalies in health care.” parameters.”

Evans gave his new views on the deaths of the infants identified in court as Baby C, Baby I and Baby P in a signed response to a Channel 5 documentary, McDonald said.

“Don’t get me wrong, I’m sure Dr. Evans is still going to say that Lucy Letby is guilty and he has a different view or a different hypothesis on that,” McDonald said. “But the cause of death before the Court of Appeal is now different, according to Dr Evans, and I think this is a profound issue that needs to be revisited.”

Evans has not yet responded to a request for comment following the McDonald’s press conference.

Additionally, two neonatologists working with the defense said there were medical reasons why Baby C and Baby O became ill and could not be resuscitated, McDonald said.