Sources say the FBI has identified a suspect in the death of Capital Police Officer Brian Cinick

It is a difficult case for investigators and it is not clear what charges they will be able to bring.

In a police audio dio played during former President Donald Trump’s Senate impeachment hearing, officers could be heard screaming during the attack that some members of the violent Capitol mob were spraying them with bear spray. Republican Sen. of Utah. Mitt Romney told reporters at the time that Capitol police officer Eugene Goodman, who presumably rescued the senator from a mob, had hinted to Romney that “he had to breathe a lot of bear spray and tear gas and that he was serving in January.” The pair spoke during a break in the hearing.

Investigators struggled for weeks to make a federal murder case in Seeknik’s death, as they leaked on video and photographs to determine the moment he suffered his fatal injuries. Investigators have determined that initial reports suggest that it was not true that Signik was struck by a fire extinguisher, CNN reported earlier.

Some have been charged with assaulting police officers in the weeks following the attack, but no one has yet been arrested in connection with the coin. More than 100 other police officers were injured in the melee last month, which required at least 15 people to be hospitalized, according to court documents.

Sikkin’s body was laid to rest at the Capitol in an emotional ceremony earlier this month, during which President B Biden, First Lady Jill Biden and congressional leaders visited.

This story has been updated with background information.

David Shortle of CNN contributed to this report.