The mother of the US Capitol police officer who died following the riot on January 6 believes that her son succumbed to a fatal stroke - that he was not bludgeoned to death by a fire extinguisher as reported.

Yet more than one month after Officer Brian Sicknick's death on January 7, she has admitted that they are still in the dark as to what exactly caused that catastrophic episode.

Speaking exclusively to DailyMail.com Gladys Sicknick, 74, was unequivocal in her assertion that Officer Brian Sicknick was not struck on the head and that as far as the family knows her son had a fatal stroke.

The official statement from the U.S. Capitol Police Department was measured and vague as to the cause. According to the police, "Officer Brian D Sicknick passed away due to injuries sustained while on duty."

It continued, ‘Officer Sicknick was responding to the riots on Wednesday, January 6, 2021, at the U.S. Capitol and was injured while physically engaging with protesters. He returned to his division office and collapsed. He was taken to a local hospital where he succumbed to his injuries."