The medical examiner, Francisco J. Diaz told The Washington Post that the autopsy found no evidence the 42-year-old officer suffered an allergic reaction to chemical irritants, which Diaz said would have caused Sicknick's throat to quickly seize.
Capitol Police Officer Brian Sicknick, who was injured while confronting rioters during the January 6 insurrection, suffered a stroke and died from natural causes, the Washington, D.C., medical examiner's office ruled Monday, a finding that lessens the chances that anyone will be charged in his death.
Two men are accused of assaulting Sicknick by spraying a powerful chemical irritant at him during the siege.
Lawyers for the two men had no immediate comment Monday.
However, the examiner's report also suggested that the riot likely played a role in causing the stroke, noting that "all that transpired played a role in his condition".
The report's release highlights the shifting understanding of the officer's death since the day after the riot.
In February, Sicknick became only the fifth person in history to lie in honor in the Capitol Rotunda, a designation for those who are not elected officials, judges or military leaders.
We have covered many times before the curious lack of medical evidence as to how Capitol Police Officer Brian Sicknick died.
Sicknick was one of five people who died after a pro-Trump mob stormed the U.S. Capitol, interrupting the electoral count that certified Joe Biden as the victor of the November election.
Acting U.S. attorney general Jeffrey A. Rosen said in a January 8 statement that Sicknick died of "the injuries he suffered defending the U.S. Capitol".
The findings mean it will be hard for federal prosecutors to bring homicide charges in connection with Sicknick's death.
The Chief Medical Examiner's report confirms that this was not the case.
Sicknick was standing guard with other officers behind metal bicycle racks as the mob descended on the Capitol.