historyLibrary of Congress: Headlines & Heroes1859 · Lafayette Square, Washington, D.C., USA

Murder in Lafayette Square

the gist

In 1859, Congressman Daniel Sickles shot and killed Philip Barton Key, the U.S. District Attorney, in broad daylight on Lafayette Square in Washington. Key was the son of Francis Scott Key, and Sickles had reportedly discovered that Key was having an affair with his wife. The murder and the trial that followed captivated antebellum America and raised national debates about male honor, female virtue, insanity and the rule of law. Sickles was tried for murder and acquitted after arguing temporary insanity, one of the first times the defense was used successfully in such a case in the United States. The case is a window into the social codes of nineteenth-century Washington and the status of the courts in an era of intense public scrutiny.

so what

The trial helped define the insanity defence in American courts and showed how personal honour could override the law in the public imagination. It remains a vivid example of how a single crime can become a national argument about society.

fun fact

Philip Barton Key was the son of Francis Scott Key, who wrote the lyrics of The Star-Spangled Banner.

Library of Congress (Headlines & Heroes)

Illustrative photo · Library of Congress Prints and Photographs Division, Public domain, via Wikimedia Commons