12:54 PM ET Tributes are flooding in for William "Billy" Evans, the 18-year veteran of the U.S. Capitol Police who was killed in Friday's attack at a Capitol checkpoint. Evans is being mourned by lawmakers as a hero and remembered by friends as a caring father, dedicated officer and good-natured jokester. The country is reeling from the attack, which took place at the north barricade of the Capitol building just after 1 p.m. A suspect rammed his car into Evans and another officer and crashed into a barrier, then got out and started running toward them while wielding a knife, police said.