Metropolitan Police Department of the District of Columbia formed DC Board of Commissioners, established by Congress to govern the entire District. That year as well, Thomas P. Morgan was named to replace Richards, who had resigned, as Major and Superintendent. Although a police fund had been established during the MPD's first year to assist those officers injured in the line of duty, Morgan would add to this by establishing a retirement fund for older officers who could no longer perform their duties. On July 2, 1881, the MPD took part in investigating the assassination of President James A. Garfield. The assassin, Charles J. Guiteau, approached Garfield at the
Charles J. Guiteau Scoville then became lead counsel for the defense. While Scoville's legal experience lay in land title examination, he had married Guiteau's sister and was thus obliged to defend him in court when no one else would. Wayne MacVeagh, the U.S. Attorney General, served as the chief prosecutor. MacVeagh named five lawyers to the prosecution team: George Corkhill, Walter Davidge, retired judge John K. Porter, Elihu Root, and E.B. Smith. Guiteau's trial was one of the first high-profile cases in the United States where a defense based on a claim of temporary insanity was considered. Guiteau vehemently insisted that while he