Why the Rule Existed

Why the Rule Existed

The year-and-a-day rule grew out of a practical worry that early judges could not avoid: how long after a blow can a court trust the claim that the blow produced a death? Its lineage is generally traced to the thirteenth century, when a version of it served as a time limit on the private action for murder known as the appeal of death.¹ The justification most often given for carrying it into homicide prosecutions was medical. Thirteenth-century science could not establish causation beyond a reasonable doubt when a great deal of time had passed between the injury and the death.² Because the prosecution must prove every element beyond a reasonable doubt, and because a death caused by the defendant's act is an element of homicide, a long and medically murky gap threatened to turn trials into guesses. The judges responded by creating an absolute rule of law instead of leaving that doubt to each jury.³

That history yields two reasons, and they work on different problems. The first is a problem of proof: medicine of the period could not reliably trace a death back to a wound after a long interval, so the prosecution would have asked a jury to accept a causal chain that no expert could verify. The second is a problem of intervening events. Even with good medicine, a victim who survives for many months is exposed to disease, accident, and poor care, and each of those is a candidate cause of death that has nothing to do with the defendant, so the probability of an intervening cause grows with every month of survival.⁴ When the cause stayed in doubt, the better course was to resolve the doubt for the defendant.⁵ The proof reason concerns what the evidence can show, while the intervening-cause reason concerns what probably happened, so the two support the cutoff from different directions.

Rogers v. Tennessee shows both concerns at full strength. Wilbert Rogers stabbed James Bowdery in the heart, and Bowdery survived the surgery but lost oxygen to the brain, remained in a coma, and died about fifteen months later of a kidney infection, a common complication in comatose patients.⁶ The long interval and the intermediate infection are exactly the kind of delay and intervening event that the rule's reasoning targets. The rigidity of the rule also shows here, because the county medical examiner's testimony tracing the death to the stab wound was undisputed.⁷ A categorical cutoff does not ask whether the proof is actually shaky in the case at hand, which is why the rule can bar a homicide charge even where the medical evidence is undisputed.⁸ Rogers was convicted only because Tennessee's highest court abolished the rule and applied that decision to him, a step taken up later in this chapter.⁹

A short-interval case marks the other pole. In State v. Ruane a defendant invoked the year-and-a-day rule while arguing that the removal of life support, rather than the gunshot wound he inflicted, was the operative cause of the victim's death.¹⁰ The victim had died within ten days of the wound, and the Court of Criminal Appeals went on to hold that the evidence of causation was sufficient to support the conviction.¹¹ Ten days sits far inside the period, so the doubt the rule responds to has no room to arise, and the defendant's argument was an ordinary dispute about cause that a court resolves on the evidence. The variable that matters for the rule's reasoning is the length of the gap and the room it leaves for other events.

Both cases also clarify how the rule differs from ordinary proximate cause. Proximate cause normally asks, case by case, whether the link between the act and the death is too stretched to hold the defendant responsible. Under that inquiry, complications that the injury or the treatment it required would normally bring on do not break the causal chain, so a comatose victim's infection would ordinarily leave the defendant answerable for the death.¹² The year-and-a-day rule does not run that inquiry. It decides the question in advance for one kind of stretch, long delay, and gives the same answer whatever the facts. A fixed line trades individualized accuracy for predictability: it spares courts uncertain medical inquiries, but it is harsh in the rare case where causation can be proved. Courts that later abandoned the rule made that last point against it, observing that the presumption was wooden and arbitrary from the start because it blocked a conviction even where the cause of death could be shown.¹³

Two descriptions of the rule circulate, and a student will meet both. One places the rule within causation: a death more than a year and a day after the blow is treated as not caused by the blow.¹⁴ The other describes the rule as a bar on the homicide charge that applies even where but-for causation is clear.¹⁵ The two descriptions lead to the same result on a late death, since the court never reaches the medical evidence, so the first practical question is always the length of the gap. Both reasons also rest on the limits of what physicians could know and prove. A rule built on those limits loses its footing as medicine improves, and that dependence explains the rule's decline, which the next section takes up.