Principle Statement:
Ratio Decidendi (Source): “In a murder case, for the prosecution to prove its case in certain cases, it must produce evidence that the victim of the offence not only died but also the cause of death and it was the act of accused person that caused that death. The cause of death is easily proved by evidence of witnesses who saw the very act that caused the death or in some cases of injuries to the victim, the medical evidence if available, of the doctor who examined the corpse and proffers opinion as to the cause of death… In a circumstance as this, no medical evidence, which would be at best strong opinion, was necessary as to the cause of death. By its nature a hammer is a lethal weapon, whatever the size.”
Per Belgore, JSC, in Emwenya v. A.G., Bendel State (1993) NLC-1451992(SC) at pp. 7-8; Paras D–B.
Explanation/Scope: This principle establishes that while medical evidence is valuable in murder prosecutions, it is not always legally necessary to prove cause of death. The prosecution must prove three elements: (1) the victim is dead; (2) the cause of death; and (3) the accused’s act caused that death. However, cause of death can be established through different types of evidence. Medical evidence (autopsy reports, expert testimony) is one method, particularly valuable for: non-obvious causes of death, poisoning, internal injuries, distinguishing between multiple potential causes, or determining time of death. But direct eyewitness evidence may suffice where witnesses observed the fatal act—seeing someone shot, stabbed, or beaten to death provides direct proof of causation without requiring medical confirmation. Similarly, the inherently lethal nature of the weapon and manner of use may make the causal connection obvious. A hammer to the head, gunshot to vital organs, or severe beating witnessed by observers establishes causation through common knowledge and observation, not requiring medical expertise. The principle recognizes practical realities: medical evidence may be unavailable (no autopsy performed, body decomposed, rural areas lacking facilities); medical evidence is opinion, not fact, and may be contradicted; direct evidence of the fatal act may be more reliable than post-mortem inference. However, absence of medical evidence becomes problematic where: cause of death is unclear, multiple potential causes exist, significant time elapsed between injury and death, or the defense raises credible alternative explanations. Courts must assess whether, in the specific circumstances, the non-medical evidence sufficiently establishes causation. The principle prevents technical acquittals where causation is obvious from direct evidence but medical confirmation is unavailable
