He told his brother he got pepper sprayed... did not mention ANYTHING about getting hit anywhere on his body by ANYTHING (let alone hit in the head by a fire extinguisher)
https://www.lawofficer.com/autopsy-results-remain-pending-in-death-of-brian-sicknick-as-lawmakers-pay-tribute/
“He texted me last night and said, ‘I got pepper-sprayed twice,’ and he was in good shape,” said Ken Sicknick, his brother, as the family drove toward Washington. “Apparently he collapsed in the Capitol and they resuscitated him using CPR.”