District of Columbia City Hall Scott Key, (1779–1843), and was sentenced to a mental institution. The building was also the site of the 1867 trial of John Surratt, an alleged conspirator in the assassination of Abraham Lincoln who was later acquitted. However, Charles J. Guiteau, the assassin of President James A. Garfield, was convicted at the courthouse in 1882. The Old City Hall was the scene of a fugitive slave trial known as the "Pearl incident," which was the largest single escape by slaves attempted in U.S. history. Two men were convicted in 1848 of attempting to free more than 70 slaves by sailing them
Charles R. Skinner in Washington D.C. in 1882, and had been asked to attend the execution of Garfield's assassin, Charles Guiteau, but was unable to attend due to the illness of his daughter. He was invited to Czolgosz's execution by the warden of Auburn Prison, and attended as one of only twelve "official" witnesses to the execution as required by New York law. Less than two months after shooting McKinley, Czolgosz was executed on October 29, 1901 in Auburn Prison. Czolgosz was executed in the electric chair, an early usage of this new form of execution. Thomas Edison later re-enacted the execution in