It remains a difficult case for investigators and it’s not clear what charge they will be able to bring.
In a statement late Friday, the US Capitol Police noted that the medical examiner’s report on Sicknick’s death wasn’t finished yet: “We are awaiting toxicology results and continue to work with other government agencies regarding the death investigation.”
“Officer Sicknick’s family has asked for privacy during this difficult time and that the spreading of misinformation stop regarding the cause of his death,” the statement said. “The Department and the Sicknick family appreciate the outpouring of support for our fallen officer.”
Investigators have struggled for weeks to build a federal murder case in Sicknick’s death as they pored over video and photographs to try to determine the moment in which he suffered his fatal injuries. Investigators determined that initial reports suggesting Sicknick had been struck with a fire extinguisher weren’t true, CNN previously reported.
Several people have been charged with assaulting police officers in the weeks since the attack, but none so far in relation to Sicknick. More than 100 other police officers were injured in the melee last month, including at least 15 who required hospitalization, according to court documents.
This story has been updated with background information and a statement from US Capitol Police.
Read More: FBI identifies suspect in death of Capitol Police Officer Brian Sicknick, sources say