manslaughter

Manslaughter is a compound of Old English man (person) and slæht (slaughter, killing), from slean (to strike, to slay). The word is purely Germanic — no Latin, no French. It existed in Old English as mannslieht before the Norman Conquest. Murder, by contrast, came from Old French murdre (from Frankish *murthran). English common law needed both words because it recognized two kinds of unlawful killing: deliberate (murder) and unintentional or provoked (manslaughter).

The distinction crystallized in the sixteenth and seventeenth centuries. Murder required malice aforethought — the intent to kill. Manslaughter did not. The classic example was a killing in the heat of passion: a man who discovered his wife in bed with another man and killed the lover in a rage committed manslaughter, not murder. The provocation reduced the moral culpability. The killing was still unlawful. The anger was considered human.

Modern law divides manslaughter into voluntary and involuntary. Voluntary manslaughter is an intentional killing that would be murder except for a mitigating circumstance (provocation, diminished capacity). Involuntary manslaughter is an unintentional killing caused by criminal negligence or during the commission of an unlawful act. Vehicular manslaughter — killing someone through reckless driving — is the most commonly prosecuted form.

The Anglo-Saxon compound has outlasted centuries of legal evolution. Murder carries a heavier sentence. Manslaughter carries a lighter one. The difference is in the mind — whether the killer planned to kill or whether the killing happened without premeditation. The same dead body, two different words, two different sentences. The distinction is entirely about what was in the killer's head.