WASHINGTON - A photo of at least one protester who may be linked to the death of Capitol police officer Brian Sicknick amid a riot on Capitol Hill has been released.Download the FOX 5 DC News App for Local Breaking News and WeatherLouisiana Senator Bill Cassidy released the photo showing a man with a salt-and-pepper beard and a cap with the initials "CFD" Tuesday morning.Federal investigators continue to track down people from across the country accused in the siege on the U.S.