On January 6, 2021, the United States Capitol Building in Washington, D.C., was attacked by a mob of supporters of then-U.S. president Donald Trump, two months after his defeat in the 2020 presidential election. They sought to keep Trump in power by occupying the Capitol and preventing a joint session of Congress counting the Electoral College votes to formalize the victory of President-elect Joe Biden. The attack was ultimately unsuccessful in preventing the certification of the election results. According to the bipartisan House select committee that investigated the incident, the attack was the culmination of a seven-part plan by Trump to overturn the election. Within 36 hours, five people died: one was shot by Capitol Police, another died of a drug overdose, and three died of natural causes, including a police officer. Many people were injured, including 174 police officers. Four officers who responded to the attack died by suicide within seven months. Damages caused by attackers exceeded $2.7 million.

On January 7, 2021, a United States Capitol Police (USCP) officer, Brian Sicknick, died after suffering two strokes the day after he responded to an attack on the U.S. Capitol. The District of Columbia chief medical examiner found that Sicknick had died from stroke, classifying his death as natural and additionally commented that "all that transpired played a role in his condition", a decision which was criticized by some expert neurologists, who have stated that stress from the attack may have very well caused the stroke. His cremated remains were laid in honor in the Capitol Rotunda on February 2, 2021, before they were buried with full honors at Arlington National Cemetery.