The Man Who Shot the Wrong Person and Changed the Law - Episode 107

The Man Who Shot the Wrong Person and Changed the Law: The Murder of Edward Drummond

A stranger stood outside 10 Downing Street for weeks, watching. Soldiers noticed him. Police questioned him. He told them he was waiting for a gentleman. On January 20, 1843, he finally stopped waiting — and fired a pistol into the back of a man he had never met, a man he was absolutely certain was someone else. The jury heard the evidence, deliberated, and found him not guilty. What happened next rewrote the legal definition of criminal responsibility for two countries.

In this episode, we explore how Daniel McNaughton spent over a year reporting a conspiracy against his life to Scottish police — and was dismissed — how a single case of mistaken identity between two men of identical height and routine created a legal precedent still cited in American courtrooms today, and why Queen Victoria personally intervened after the verdict to demand a stricter standard. Was this a calculated act of political violence, or the endpoint of a documented psychotic collapse that no institution chose to stop? The forensic record and the testimony of nine medical experts point in opposite directions.

Case Details

Victim: Edward Drummond, approximately 43, private secretary to British Prime Minister Sir Robert Peel.

Date: January 20, 1843.

Location: Whitehall, London, England, United Kingdom.

Case Status: Daniel McNaughton was found not guilty by reason of insanity at the Old Bailey in March 1843 and committed to Bethlehem Royal Hospital for 20 years. No criminal conviction was ever entered. The case directly produced the McNaughton Rule, still the dominant legal insanity standard in approximately half of U.S. states.

Episode Key Points

- McNaughton had reported his persecutors to the Glasgow police commissioner 18 months before the shooting — the same officer later testified at trial, confirming the delusions were documented and dismissed by authorities.

- Drummond and Prime Minister Sir Robert Peel were the same height, maintained identical daily routines through Whitehall, and were routinely mistaken for one another by people who knew them.

- McNaughton was carrying a second loaded pistol at the moment of arrest and had additional ammunition in his coat pockets and in his rented room on the same street as the shooting.

- Queen Victoria personally pressured the House of Lords after the not-guilty verdict, directly triggering the parliamentary creation of the two-part insanity standard now known as the McNaughton Rule.

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