A television documentary airing tonight is expected to ask fresh questions about medical experts’ claims that Lucy Letby murdered and tried to kill multiple babies.

Now-retired Guernsey paediatrician Sandie Bohin was one of the experts for the prosecution when Letby was convicted of seven murders and further seven attempted murders.

She was used to back up evidence given for the prosecution by Dr Dewi Evans, who believed that Letby had injected some of her victims with air, causing embolisms.

Other victims are recorded as dying or suffering injuries after being injected with insulin.

However, Letby’s conviction has been criticised by numerous medical and legal experts who say there is no proof that she did anything to harm any of the babies, and that there is no evidence of the method of killing described by Dr Evans and backed up by Dr Bohin.

Pictured: Dr Sandie Bohin and Dr Dewi Evans pictured by the Daily Mail during Letby’s trial.

The Sun documentary will be aired on Channel 5 at 22:00 tonight.

It will feature interviews with staff from the Countess of Chester Hospital, where the murders and attempted murders happened, along with a false confessions expert, a statistician, and a Death Investigator.

The trailer shows that the documentary will repeat widely shared claims that Letby has been used as a ‘scapegoat’ for failings at the Countess of Chester Hospital.

Today’s Sun newspaper also reports that the documentary, based on research carried out by Investigations Editor Rob Pattinson, will claim that Dr Evans’ evidence is not backed by other neonatologists.

He and Dr Bohin are both retired paediatric consultants.

Both had been employed as medical experts in other criminal trials prior to the Letby case.

It’s understood neither has been asked to give evidence in any trial since Letby’s conviction.

Complaints about Dr Bohin’s medical practice in Guernsey have also been linked to her involvement in Letby’s conviction.

Letby’s lawyer confirmed last year that information around the local complaints has been included in a bundle of evidence presented to the UK’s Criminal Cases Review Commission, which investigates potential miscarriages of justice.