Why this case is anchor-load-bearing
In a multi-count indictment of a nurse accused of a pattern of killing, the first indicted death functions as the anchor. The Crown’s framing of every subsequent collapse and death — the pattern argument, the air-embolism framework, the shift chart — starts from the premise that the first death was deliberate. If that premise fails, the subsequent pattern argument loses its starting point.
Baby A is that first death. What the jury accepted about Baby A determined what they could accept about everything else. Independent review since 2024 says the reading the jury accepted on Baby A was not well-founded.
The clinical context
Baby A was a preterm twin, born at approximately 31 weeks as part of a multiple pregnancy. Twin-pregnancy babies carry elevated risk; a 31-week infant is squarely within the extremely-preterm range in which respiratory, circulatory, and infection-related instability is routine. Baby A’s specific antenatal and early-neonatal history placed him in the higher-risk end of the 31-week population.
The prosecution theory
The Crown argued that Lucy Letby injected air into Baby A’s venous line, producing a sudden cardiac and respiratory collapse from which resuscitation was unsuccessful. The mechanism rested on:
- The Lee & Tanswell 1989 air-embolism diagnostic framework applied to the skin signs.
- The coincidence of Letby’s shift with the collapse.
- The perceived improbability of sudden collapse in an otherwise-stable-seeming preterm infant.
What independent specialists read from the same record
- The skin signs do not match the 1989 paper. See our line-by-line comparison. Dr Shoo Lee, the paper’s lead author, has publicly stated the skin descriptions at trial do not meet the diagnostic specificity his paper describes.
- No post-mortem confirmation. No imaging or histology demonstrated the intravascular gas pattern that air embolism would produce. The Crown’s theory was an inference from the clinical signs, not a confirmed finding.
- Thrombotic collapse is an undercanvassed alternative. A preterm twin with a central venous catheter is at elevated thrombotic risk. Thrombotic collapse can produce the observed clinical picture, and the mottled skin, without any deliberate act.
- Twin-pregnancy-related instability. A surviving twin, particularly in the early post-natal period, is at substantial risk of sudden deterioration from a range of natural causes. Baby A’s twin (Baby B) subsequently collapsed and survived — the pattern of successive twin deterioration is recognised in twin-pregnancy outcomes literature.
- Unit-context factors. The Countess of Chester neonatal unit was, in June 2015, operating with documented staffing and infrastructure pressures. Sub-optimal care contribution to the deterioration of a high-risk preterm infant is plausible and the Panel’s framework explicitly includes it as an alternative explanation.
The impact on everything else
If the reading above is correct — that Baby A’s death is explicable by the natural trajectory of an unstable preterm twin on a struggling unit — then the Crown’s anchor fails. Every subsequent count was presented in the context of a pattern that started on 8 June 2015. The pattern is only pattern if each of its constituent events was deliberate. If Baby A was not, the pattern argument does not begin.
The triplet-twin-and-sibling relationship
Baby A’s twin (Baby B) collapsed the following night and was resuscitated. This sequence is, in the obstetric literature, a recognised high-risk twin-pregnancy outcome pattern. The surviving twin after a sibling death in utero or immediately post-natally is at elevated risk for the same underlying causes that affected the first twin. Treating the two collapses as independent criminal events is not supported by the biology of twin pregnancies. See our twins and multiples deep-dive.