Earlier quoted context omitted.
The fire extinguisher attack turned out to be BS. https://www.yahoo.com/entertainment/capitol-police-officers-...
That's a long conclusion to make. The statement that it had not been determined that blunt force trauma specifically caused Officer Sicknick's death doesn't make the attack BS - there's video footage of him being hit with one. And dying within 24 hours from a hemorrhagic stroke is definitely not enough to rule out the proximal impact of fire extinguishers and other implements used to beat him.
You should forward that video footage to law enforcement right away, because they don't even have it. I'll even cite CNN, because I assume you believe they are trustworthy.
https://www.cnn.com/2021/02/02/politics/brian-sicknick-charg...
"Investigators are struggling to build a federal murder case regarding fallen US Capitol Police officer Brian Sicknick, vexed by a lack of evidence that could prove someone caused his death as he defended the Capitol during last month's insurrection. Authorities have reviewed video and photographs that show Sicknick engaging with rioters amid the siege but have yet to identify a moment in which he suffered his fatal injuries, law enforcement officials familiar with the matter said. "
"According to one law enforcement official, medical examiners did not find signs that the officer sustained any blunt force trauma, so investigators believe that early reports that he was fatally struck by a fire extinguisher are not true."