The clinical context
Baby E was the first-born of a pair of preterm twins. His sibling — Baby F — was prosecuted as a separate count on the insulin evidence, not on an air-embolism theory. Baby E died in the early hours of 4 August 2015 on the Countess of Chester neonatal unit. His mother had, in her own account subsequently given publicly, observed him bleeding from the mouth in the period before his collapse.
The clinical picture preceding death included abdominal distension, a bleeding episode from or around the mouth/NG tube, and rapid deterioration. Resuscitation was attempted and was unsuccessful.
The prosecution theory
The Crown’s case on Baby E combined two mechanisms. First, it alleged air embolism via a venous line as the cause of acute collapse. Second, it alleged deliberate trauma or tampering producing the bleeding. Both mechanisms were attributed to Lucy Letby on the basis of her presence and the perceived implausibility of a natural trajectory.
What independent specialists read from the same record
The Panel’s case-by-case review and the independent paediatric-pathology reports filed with the CCRC read Baby E’s case differently. The key counter-points:
- Thrombosis. A preterm infant with a central venous catheter in place is at elevated risk of thrombosis. Thrombotic events can produce sudden circulatory collapse with mottled skin appearance — a presentation that has been misread at trial as suggestive of air embolism. The differential of thrombosis against air embolism is, in Baby E’s case, resolved in favour of thrombosis as the more parsimonious explanation by independent reviewers.
- GI bleeding as natural pathology. Upper GI bleeding in a preterm infant can arise from stress ulceration, coagulopathy (common in preterm infants under physiological stress), or mucosal injury from NG-tube insertion. None of these requires deliberate trauma. The prosecution theory required a specific, deliberate act to produce the bleeding; a natural-pathology reading does not.
- The twin-pregnancy context. Twin-to-twin transfusion syndrome and selective intrauterine growth restriction produce differential post-natal risk profiles between the two babies. Baby E’s presentation was consistent with the high-risk end of a twin-pregnancy outcome profile. See our twins and multiples deep-dive.
- No specific forensic finding. No post-mortem investigation specifically confirmed air embolism. No post-mortem imaging or histology showed the intravascular gas pattern air embolism would produce. No physical exhibit was retained that would corroborate deliberate tampering.
Why this case is important
Baby E’s case was one of the earlier indicted counts. If the Panel’s reading is correct — that the case is explicable by thrombosis and natural coagulopathy in a preterm twin — the case cannot support a murder conviction. That does not itself answer the question of what happened; it answers the question of whether the evidence supports the inference the jury was asked to draw. Independent specialist review says it does not.
The mother’s subsequent account
Baby E’s mother has, since the verdict, given public accounts of what she observed in the hours before his death. Those accounts have been incorporated into the Panel’s case-by-case review. The specific details of her observations are consistent with the thrombosis-and-natural-bleeding reading, not with the Crown’s deliberate-tampering reading. Her testimony is addressed in the October 2025 CCRC application materials.
What a proper differential-diagnosis review asks
- What was the baby’s coagulation profile on the day of death?
- What imaging was obtained to look for thrombotic events?
- What post-mortem investigations specifically examined for intravascular gas?
- What histological examination was conducted on the bleeding site?
- What was the physiological state of the sibling (Baby F) at the same time?
A proper differential-diagnosis review would answer these questions systematically and eliminate each hypothesis only after positive examination. The trial process did not run that loop.