When Does an Omission Still Matter to Death? Medical Irreversibility and Criminal Liability for Failure to Act

Criminal liability for omission causing death depends not only on whether a defendant had a duty to act, but also on what timely intervention could still have achieved when that duty should have been performed. In medical cases, retrospective focus on death may obscure the transition from recoverability to irreversible dying. This paper uses the concepts of a life-preservable clinical state (LPCS), medical recoverability, the irreversible dying transition (IDT), and the irreversible dying process (IDP) to clarify that structure. Medical recoverability exists while at least one medically reasonable restorative pathway remains; loss of recoverability occurs when the final such pathway disappears, and IDT marks the temporal boundary of that loss. The paper distinguishes omissions occurring while recoverability remains, omissions contributing to loss of recoverability at IDT, and omissions occurring only after IDT. Loss of recoverability is not proposed as a new offence or independently punishable result, but as a medically significant intermediate causal fact connecting an earlier omission to a later death. IDT likewise does not determine duty, causation, fault, or guilt; it identifies what medicine could still have changed at the legally relevant time. After IDT, causation does not end, but the relevant counterfactual shifts from restoration to matters such as prolongation of life, acceleration of death, suffering, or manner of dying. The framework aims to improve the temporal and causal precision of criminal omission analysis without replacing criminal doctrine with medical judgment.