The incident began Friday when Green rammed his vehicle into the north barricade of the U.S. Capitol near the Russell Senate Office Building.
An attack at the US Capitol complex in Washington DC has left one police officer dead and another seriously injured.
Berkshire County native William "Billy" Evans, who grew up in North Adams and neighboring Clarksburg, graduated from Western New England University.
The suspect was shot dead by one of the officers after he "exited the auto with a knife in hand" and "lunged" at the officers, acting Capitol Police Chief Yogananda Pittman said at a press conference following the incident, as Insider previously reported.
The man who rammed a auto into two officers at a barricade outside the U.S. Capitol, killing one of them before he was shot to death by police, had been suffering from delusions, paranoia and suicidal thoughts, a U.S. official told The Associated Press on Saturday.
Pittman said there was no immediate indication of his motivation or police file on him.
"This time it does not appear to be an ongoing threat", Robert Contee, the acting chief of the Washington Metropolitan Police Department, told reporters Friday.
"We saw the vehicle barriers perform the way they should".
The breach happened inside the perimeter, as the driver slipped through a gate that had opened to allow traffic in and out of the Capitol and rammed a barrier that had protected the building long before January 6.
US President Joe Biden said he was heartbroken by the death of the police officer, Reuters reported.
William Billy Evans joined the department in 2003 and was a member of its first responders unit.
"It's an eyesore, it sucks", Democratic Rep. Tim Ryan of OH, the chairman of a House spending committee that oversees security and the Capitol, said of the fencing in the hours after Officer Evans and the driver were killed.
In 2013, officers with the Capitol Police and Secret Service fatally shot a woman inside her auto after she led them on a high-speed chase that began outside the White House.
The question of security at the Capitol has generated a heated debate in Congress amid a highly politicised environment following the Jan 6 riot and former president Donald Trump's role in inciting his supporters to violence.
One officer has died of their injuries, another is in hospital in a "stable and non-threatening condition".
The crash and shooting happened at a security checkpoint near the Capitol typically used by senators and staff on weekdays, though most are away from the building during the current recess.