AdvertisementSlain U.S. Capitol Police Officer Was An 18-Year Department Veteran, Father Of 2Updated April 03, 2021Rachel TreismanfacebookEmailU.S. Capitol Police Officer William "Billy" Evans, who was killed Friday, was an 18-year veteran of the force and a member of the agency's first responders unit. (AP)This article was originally published on April 03, 2021.