FILE - This Aug. 16, 2006, file photo provided by the U.S. Marshals Service shows Deputy U.S. Marshal Christopher David Hill, shot to death early Thursday, Jan. 18, 2018, while serving an arrest warrant inside a home in Harrisburg, Pa. Laboratory tests indicate Hill was killed by a bullet that was fired by a fellow officer and passed through a wall, Dauphin County District Attorney Fran Chardo said Thursday, March 1, 2018. Hill was a U.S. Army veteran and native of Sacramento, California, who served the U.S. Marshals Service for 11 years. (U.S. Marshals Service via AP, File)