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The trial of Congressman Daniel Sickles for the murder of Philip Barton Key begins in Washington D.C.

Daniel Sickles, detail
New York Congressman Daniel Sickles shot and killed U.S. District Attorney Philip Barton Key on a Sunday morning near Lafayette Park in Washington D.C. following his wife's confession the previous day of her protracted adultery with the victim. Sickles surrendered immediately and went on trial for premeditated murder in the Washington court of Judge T. H. Crawford. His defense team included James T. Brady of New York and the future secretary of war Edwin Stanton. After a twenty-day trial, Sickles was acquitted in what was seen as the first temporary insanity defense in U.S. legal history. (By John Osborne)
Source Citation: 
Felix G. Fontaine, Trial of the Hon. Daniel E. Sickles for the Shooting of Philip Barton Key, Esq., U.S. District Attorney of Washington, D.C., February 27, 1859 (New York: R.M. De Witt, 1859), 6.