It remains a difficult matter for investigators and it is not clear what charges they can bring.
In a statement late on Friday, the US Capitol Police noted that the medical examiner’s report on Sicknick’s death was not ready: “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 to stop the spread of misinformation about 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 into Sicknick’s death, digging into video and photos to try to pinpoint the moment when he sustained his fatal injuries. Investigators determined that the initial reports suggesting Sicknick had been hit with a fire extinguisher were untrue, CNN previously reported.
Several people have been accused of assaulting police officers in the weeks following the attack, but not so far in relation to Sicknick. More than 100 other police officers were injured in the melee last month, including at least 15 who had to be included according to court documents.
This story has been updated with background information and a statement from US Capitol Police.