Robert Forsyth (1754–11 January 1794) was an American patriot who served as a Captain in Lee's Legion under Henry "Light Horse Harry" Lee. He was selected by President George Washington to be the first United States Marshal for the state of Georgia and became the first U.S. Marshal and third law enforcement officer killed in the line of duty.

Source: http://en.wikipedia.org/wiki/Robert_Forsyth_%28U.S._Marshal%29