Lucy Letby was on obligation for all however one in all 13 child deaths in a single 12 months at hospital the place she labored, regardless of claims by supporters

Killer nurse Lucy Letby was on duty for all but one of 13 baby deaths in one year at the hospital where she worked, documents leaked to the Mail have revealed.

The former neonatal nurse was convicted of murdering seven babies, who died between June 2015 and June 2016 at the Countess of Chester Hospital.

But the Mail has learned of six more baby deaths – four girls and two boys – over the same period of time at the hospital, with Letby on duty or recently finishing a shift when five of them died.

Those doubting Letby’s convictions, including senior Tory MP David Davis, have repeatedly claimed she was not present for most of the other deaths.

This week the MP told Parliament Letby was blamed by doctors on a ‘gut feeling’ because she was working ‘on each occasion an infant died’.

‘The doctors’ gut feeling was based on a coincidence: she was on shift for a number of deaths, although, and this is important, far from all of them,’ he said.

He also called for a retrial, saying Letby’s convictions were based on ‘flawed’ evidence and that she had been the victim of a ‘clear miscarriage of justice.’ 

But the Mail has seen a document, created in 2016 by Letby’s then-boss, neonatal manager Eirian Powell, appearing to prove Sir David’s claims wrong.

Killer nurse Lucy Letby was on duty for all but one of 13 baby deaths in one year at the hospital where she worked, documents leaked to the Mail have revealed

Supporters of ex-nurse Lucy Letby demonstrate outside the High Court in London during her appeal hearing

The former neonatal nurse was convicted of murdering seven babies, who died between June 2015 and June 2016 at the Countess of Chester Hospital

Letby was on duty or had been on shift less than a couple of hours before five of the six other babies died, according to the document.

Contrary to what Sir David told MPs, she was on shift or had only just clocked off when a total of 12 out of the 13 babies died. 

According to the prosecution’s expert medical witness, Dr Dewi Evans, who reviewed all 13 deaths, there was a plausible medical explanation, including infection and congenital abnormalities, for why some of the other six babies died.

Cheshire Police is still investigating Letby and detectives have vowed to look into the cases of all 4,000 babies she treated at the Countess of Chester Hospital and Liverpool Women’s Hospital, where she did training placements. 

Only last month police confirmed they visited Letby in prison to ask her about more alleged murders.

A source with knowledge of the case told the Mail: ‘Of course David Davis is entitled to his own opinion. But some of what he is saying is simply incorrect. He needs to check his facts. On Wednesday he essentially used parliamentary privilege to spread misinformation and it should be called out.’

Letby, 35, was also convicted of attempting to murder seven other babies, one of whom she attacked twice, after a ten-month trial at Manchester Crown Court in August 2023.

She was handed 15 whole-life terms, meaning she has no prospect of parole.

Tory MP David Davis (pictured) has repeatedly claimed Letby was not present for most of the other deaths

A sign outside the Countess of Chester Hospital in Chester where Letby worked 

Letby, formerly of Hereford, has appealed twice, but both applications were rejected.

Her barrister, Mark McDonald, announced shortly before Christmas he had evidence Dr Evans had ‘changed his mind’ on how several of the babies in the trial were killed. Mr McDonald said that, as a consequence, he would be immediately applying to the Court of Appeal, urging it to revisit their decision and look again at Letby’s case.

The Criminal Appeals Office told the Mail that ‘no application has been received’.

Dr Evans denied that he had changed his mind: ‘Mark McDonald’s observation regarding my evidence is unsubstantiated, unfounded [and] inaccurate.’

When contacted by the Mail, Sir David responded: ‘Go and talk to the professional statisticians who have been through it all. Do not come to me.’