Not going to link to it because it's from CNN, but this is also notable information.

In Sicknick's case, it's still not known publicly what caused him to collapse the night of the insurrection. Findings from a medical examiner's review have not yet been released and authorities have not made any announcements about that ongoing process.

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.