The District of Columbia chief medical examiner found that Sicknick had died as the result of two strokes, classifying his death as natural[a] and additionally commented that "all that transpired played a role in his condition",[5][2][6] a decision which was criticized by some expert neurologists, who have stated that stress resulting from the insurrection at the Capitol may have caused the stroke.[7] Multiple media outlets reported Sicknick's death was due to injuries he sustained, but months later the Washington, D.C. medical examiner reported there were no injuries to Sicknick.[5] Within a day after his death, the U.S. Capitol Police and the U.S. Justice Department each said that his death was due to injuries from the attack.[8][9][10] The media, however, continued to incorrectly report for weeks that Sicknick had died after being struck in the head with a fire extinguisher during the unrest, citing two "anonymous law enforcement officials" as their source.[5][11][12]
Sicknick's death was investigated by the Metropolitan Police Department's Homicide Branch, the USCP, and the FBI.[9] On March 14, Julian Khater and George Tanios were arrested for assaulting Sicknick with a chemical spray.[13] The medical examiner found no evidence that Sicknick had an allergic reaction to the chemical spray.[5] Prosecutors later said on April 27 that the chemical spray was pepper spray.[14][15] On January 28, 2023, Khater was sentenced to almost seven years in prison for assaulting an officer with a chemical irritant.[2][16][17][18]
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