Letby's new lawyer disputes the insulin evidence, claiming that other experts provide contradictory views regarding the babies' conditions and insulin levels.

A recent investigation revealed that a third baby under Letby's care exhibited extremely high insulin levels and low C-peptide levels, raising concerns about possible poisoning shortly after arrival.

Blood tests from two babies indicated suspiciously high insulin levels and dangerously low blood sugar, suggesting that insulin was likely administered artificially.

The case has faced scrutiny from leading doctors and scientists questioning the medical evidence and statistical analysis presented during Letby's trials.

Notably, incidents involving critically ill infants occurred on nearly one-third of Letby's shifts during her training at Liverpool Women's Hospital from 2012 to 2015.

Cheshire Police is currently investigating additional cases linked to Letby, including incidents from her training period.

Letby's lawyer intends to appeal her case through the Criminal Cases Review Commission.

Lucy Letby, a neonatal nurse, was sentenced to life in prison in August 2023 for murdering seven infants and attempting to murder six others at Countess of Chester Hospital between June 2015 and June 2016.

Her sentence includes 14 whole life orders, meaning she will never be eligible for parole.

New evidence has emerged suggesting that Letby may have harmed more babies than previously acknowledged, including a case of potential insulin poisoning.

The prosecution's case has been criticized by multiple experts, prompting calls for a retrial, with some suggesting there is a 90% chance Letby is innocent.

Letby's lawyer, Mark McDonald, has emphasized his commitment to proving her innocence, stating he would not support her if he believed she was guilty.