Capitol Police Officer William “Billy” Evans was killed Friday after a man rammed a vehicle into him and another officer and then into a barricade on Constitution Avenue just outside of the Capitol.

The suspect exited the crashed car wielding a knife, ignored commands and lunged toward officers, “at which time U.S. Capitol Police officers fired upon the suspect,” acting USCP Chief Yogananda Pittman told reporters.

Capitol Police announced that the suspect was in custody and died after being transported to the hospital.

The other officer, who has not yet been identified, was hospitalized and, according to a 6 p.m. update from Capitol Police, was in stable and nonthreatening condition.

The deadly events sent the Capitol complex into lockdown for about two hours Friday afternoon.

D.C. Metropolitan Police Chief Robert Contee told reporters that the deceased suspect was not known to the Capitol Police and that at this time there is not a known connection to terrorism.

“At this time there does not appear to be an ongoing threat,” Contee said.

The events on Friday add to what has been a deadly year for the USCP, including the death of Officer Brian Sicknick from injuries sustained in the Jan. 6 attack on the Capitol. Officer Howard Liebengood died by suicide in the days following Jan. 6 after being on the scene of the insurrection.

“It has been an extremely difficult and challenging year for us,” Pittman said.

Pittman said Evans was an 18-year veteran of the USCP and a member of the first responder unit.

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The deadly actions sparked an outpouring of gratitude for Capitol Police and condolences to Evans’ family from President Joe Biden, Speaker Nancy Pelosi and other leaders. Biden ordered flags at the White House, federal buildings, military installations and other U.S. facilities be flown half-staff, while Pelosi did the same for the Capitol.

“We know what a difficult time this has been for the Capitol, everyone who works there, and those who protect it,” Biden said in a statement.

Pelosi said in a statement that Congress is ready to help law enforcement complete a “swift and comprehensive investigation” of Friday’s events.

On behalf of lawmakers, staff and workers within the Capitol complex, Pelosi thanked Capitol Police and urged prayers for the fallen officer’s family.

“Today, America’s heart has been broken by the tragic and heroic death of one of our Capitol Police heroes: Officer William Evans. He is a martyr for our democracy,” she said.

The vehicular attack prompted Capitol Police to hold its first press conference in years, in partnership with the Metropolitan Police Department. The Capitol Police has held no media briefings and did not take any questions publicly from reporters in the wake of the Jan. 6 insurrection.

The MPD homicide division will take over the investigation, Contee announced.

Pelosi and Senate Majority Leader Charles E. Schumer spoke with Evans’ family Friday evening, with an aide to Schumer saying he told them the entire Senate mourns his death and appreciates his bravery.

“On behalf of the House of Representatives, I have conveyed our prayers and condolences to his mother Janice, with our offer of assistance to her and Officer Evans’ children Logan and Abigail. I have also conveyed the prayers of the Congress with our ongoing promise of help in any way to the family of the other Officer harmed, who exhibited great valor in defending the Capitol,” Pelosi said in a letter members