Updated at 4:37 p.m. ET
Howard Liebengood, a 15-year veteran of the U.S. Capitol Police, died Saturday off duty, according to the force. The police gave no cause of death.
In a statement, the U.S. Capitol Police Labor Committee said Liebengood, 51, was among the officers who responded to the rioting at the U.S. Capitol on Wednesday.
"We are reeling from the death of Officer Liebengood," union Chairman Gus Papathanasiou said in a statement. "Every Capitol Police Officer puts the security of others before their own safety and Officer Liebengood was an example of the selfless service that is the hallmark of USCP. This is a tragic day."
His is the second death of a USCP officer in the span of three days.
Officer Brian Sicknick died Thursday from injuries sustained the day before, when the pro-Trump mob violently stormed the Capitol.
Sicknick was a 42-year-old military veteran who had served in the Capitol Police for 12 years.
His death is being investigated by the Capitol Police and the Washington, D.C., Metropolitan Police Department's homicide branch. The Justice Department is also opening a federal murder investigation into Sicknick's death, a source familiar with the matter told NPR's Carrie Johnson.
On Sunday, police officers lined D.C. streets to watch a procession for Sicknick's body.
On Sunday afternoon, the White House issued a proclamation from President Trump, ordering flags to be flown at half-staff to honor the two fallen officers.
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