So was the police officer one of the protestors or one of those stationed at the Capitol? Was he facing charges, did he aid the protestors? Maybe I didn't read the story carefully enough but I couldn't find much detail in there, I've come away with more questions than I got answers...
Another police officer, Jeffrey Smith, has committed suicide. He was a D.C. Police officer.
https://www.politico.com/news/2021/01/27/second-officer-suicide-following-capitol-riot-463123