A Capitol police officer was killed a day after he clashed with a pro-Trump crowd at the US Capitol.

Capitol Police spokeswoman Eva Maliki said Officer Brian D. Seknik was injured while dealing with protesters on Wednesday and returned to his squad’s office where he collapsed. He was taken to the hospital, where he died around 9:30 p.m. Thursday.

Sicknick, who joined the US Capitol Police in 2008, is The fifth person dies From the violent clash on Wednesday in Washington.

Shot in the Capitol A veteran of the Air Force And an ardent supporter of Trump who was part of the mob that reached the building. Three more people died In “medical emergencies” after the riots, officials said.

News of the officer’s death came soon after Capitol Police Chief Stephen Sound has resigned Amid criticism of the department’s reaction to the rioters, who broke through the barriers, vandalized the building and clashed with the police.

A police spokeswoman said Thursday that Sund’s resignation will take effect on January 16, a few days after the inauguration of President-elect Joe Biden. The department’s union boss also called for a “change at the top”.