Who was Brian Sicknick and how did the Capitol police officer die? Updated: Apr 19 2021, 21:41 ET CAPITOL Officer Brian Sicknick was murdered after rioters stormed the Capitol building in a bid to halt Electoral College vote certification. 3 Who was Brian D. Sicknick? Brian D. Sicknick, 42, was a US Capitol police officer and military veteran. He enlisted in the National Guard after graduating high school in 1997, deploying to Saudi Arabia and then Kyrgyzstan. Sicknick joined Capitol Police in 2008 after serving in the New Jersey Air National Guard. How did the Capitol Police officer die? Officer Brian D. Sicknick was fatally hurt in a clash with MAGA rioters during the Capitol Hill protests on Wednesday, January 6, 2021.