Here's a sampling of reporting that that he suffered a stroke that resulted from being struck by a fire extinguisher:
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Gus Papathanasiou, chairman of the Capitol Police Officers' Union, said on Thursday evening he spoke too soon when he announced the death of a Capitol Police officer.Papathanasiou had said the officer died from a stroke after being on duty Wednesday during the pro-Trump riot on Capitol Hill...
ca.finance.yahoo.com
The news of the officer's death came minutes after US Capitol Police Chief Steven Sund resigned.
www.firefighternation.com
Updated: 5:45 a.m. on January 8(CNN) -- The US Capitol Police confirmed the death of one of their officers late Thursday from injuries suffered when a mob of President Donald Trump's supporters stormed t
www.cbs58.com
Capitol Police officer has died after he sustained injuries during the riot at the U.S. Capitol Thursday.
baltimore.cbslocal.com
I have seen no confirmation that the footage you posted is of this incident. Have you?
The early reporting on the incident is that he was "struck in the head while physically engaged with protesters". Was that supposed to mean a projectile hit him, but he wasn't struck by the protesters he was engaged with? If it was, it was a pretty strange way of saying it. Just read the multiple posts here on TERB that used the phrase "beaten to death". If this is the footage, I wonder how "officer struck by extinguisher thrown in his general direction that carrommed off another officer" would have played as a narrative compared to the narrative of a direct violent clash?
Be that as it may, since you don't care if I take you seriously, that neatly wraps up the issue from my perspective.