It remains a difficult case for investigators and it is not clear what charges they can bring.
In a statement late Friday, the US Capitol Police stated that the medical examiner’s report of Sicknick’s death was pending: “We are awaiting toxicological results and are continuing to work with other government agencies on the death investigation.”
“Officer Sicknick’s family has sought privacy during this troubled time and has stopped the spread of misinformation regarding the cause of death,” the statement said. “The department and the Sicknick family appreciate the support of our fallen officer.”
Investigators struggled for weeks to establish a federal murder case on Sicknick’s death as they rummaged through videos and photos to determine the moment he suffered his fatal injuries. Investigators found that initial reports that Sicknick had been hit with a fire extinguisher were not true, CNN previously reported.
In the weeks since the attack, several people have been accused of attacking police officers, but none in relation to Sicknick. More than 100 other police officers were injured in hand-to-hand combat last month, including at least 15 who were hospitalized according to court records.
This story has been updated with background information and a statement from the US Capitol Police.