Is Lucy Letby Really Guilty of 7 Murders? New Evidence Challenges 'Confession' Note Used To Convict Nurse

The most unsettling moment in Netflix's The Investigation of Lucy Letby isn't a dramatic reconstruction or a legal 'reveal'. It's the ordinary domesticity of it all: police bodycam footage inside a family home, a bedroom, the sort of private space Britons are taught to think of as sacrosanct, suddenly converted into documentary content.

Letby's parents have called that footage 'a complete invasion of privacy'. Whatever you think of their daughter, it's hard not to hear the raw panic beneath that phrase: the sense that the case has swallowed not only lives and careers, but the very idea of sanctuary.

Against that grim backdrop, the documentary does what true-crime television now routinely claims to do—'revisit the evidence'—except here the stakes are unusually high and the argument unusually combustible. Lucy Letby, a former neonatal nurse at the Countess of Chester Hospital, was convicted in August 2023 of murdering seven babies and attempting to murder six others, and she received a whole-life sentence.

In July 2024, after a retrial, she was also convicted of the attempted murder of a baby known as 'Baby K.' The case is not merely notorious; it has become a kind of national Rorschach test, split between those who see a rare female serial killer and those who see a catastrophic institutional failure looking for a face.

Is Lucy Letby Guilty? The Rota, The Note, And The Story Jurors Heard

One of the documentary's most provocative threads is its reminder of how narrative works in court. Prosecutors relied heavily on staff rotas showing Letby was on duty when babies deteriorated or died, a pattern that the film's contributors suggest would have been powerfully persuasive to jurors.

The counterpoint raised in the programme is not that rotas are meaningless, but that the same pattern could reflect staffing reality—experience, willingness to work extra shifts—rather than guilt.​

Then there is the notorious handwritten note, treated in public debate as a 'confession' and in the Letby saga as a cultural artefact. The BBC reported jurors were told Letby wrote, 'I killed them on purpose because I'm not good enough,' on a note recovered by police.

Yet reporting and summaries of the notes also indicate the same scraps of paper contained other phrases that pull in the opposite direction, including assertions such as 'I haven't done anything wrong' and fragmentary expressions of distress.

What makes this evidence so corrosive is that it sits in the grey zone between fact and interpretation. A note exists; the words are there. But whether it is confession, breakdown, self-punishment, or something messier is precisely the kind of question that can turn a courtroom into a theatre of assumptions.​

Is Lucy Letby Guilty? Insulin, Experts, And The Problem Of "New" Evidence

The film also circles back to the cases involving unexplained insulin administration—presented at trial as especially strong evidence, and later disputed in the court of public opinion.

Letby has denied responsibility for harming babies, and discussion around the insulin evidence has become part of a broader argument about what, exactly, the jury could realistically weigh when medicine becomes dense, technical and contested.

That tension is sharpened by the presence of a competing expert panel highlighted in the documentary. The panel was organised by Mark McDonald and included Dr Shoo Lee, whose earlier research was cited at trial; Lee has said he feared 'a young woman could be imprisoned for offenses she did not commit.'

According to the documentary coverage, panel members pointed to possible misdiagnoses, staffing pressure and delays in accessing doctors. A consultant from the hospital, Dr Gibbs, disputes that account in the film, arguing understaffing existed before 2015 and 2016 without a comparable spike in deaths—and he describes the online harassment consultants have faced from amateur investigators convinced of Letby's innocence.

The argument about 'new evidence' is, in truth, often an argument about trust. The panel says the science can be read differently; established voices insist the jury already heard what it needed. Somewhere in the middle sits a public that has watched too many miscarriages-of-justice dramas to be wholly comfortable, and too many institutional scandals to be wholly reassured.

Netflix's documentary doesn't deliver a neat verdict reversal, and it doesn't need to: its real subject is the social afterlife of a conviction. The case continues to metastasise into politics, media ethics and the brittle state of confidence in expertise—especially when the victims are babies and the story is almost impossible to bear.