A U.S. Capitol Police officer stands at the door of the Capitol Rotunda near where the late U.S. Capitol Police officer Brian Sicknick will lie in honor Tuesday, Feb. 2, 2021, in Washington. Salwan Georges/The Washington Post via AP, Pool Federal investigators have a suspect in the killing of Capitol Police Officer Brian Sicknick. The probe was narrowed after video footage showed the suspect attacking officers with bear spray. The assailant has not yet been publicly named by federal investigators. Visit the Business section of Insider for more stories. The FBI has narrowed in on a suspect in the death of Capitol Police Officer Brian Sicknick, The New York Times reported Friday.Sicknick was among the Capitol Police officers who defended the US Capitol against a pro-Trump mob on January 6.