A U.S. Capitol Police officer salutes as the casket containing the remains of officer William Evans, who was killed in the line of duty on April 2, arrives at the East front steps of the Capitol for a ceremony honoring the officer in the Capitol Rotunda on Capitol Hill in Washington, U.S., April 13, 2021.

Family members of U.S. Capitol Police officer William “Billy” Evans react as U.S. President Joe Biden speaks during a lying in honor ceremony on the Capitol Hill in Washington, DC, U.S. April 13, 2021. Amr Alfiky/Pool via REUTERS

U.S. House Speaker Nancy Pelosi embraces Shannon Evans, mother of U.S. Capitol Police officer William “Billy” Evans, during a lying in honor ceremony on the Capitol Hill in Washington, DC, U.S. April 13, 2021. Amr Alfiky/Pool via REUTERS

U.S. President Joe Biden gives a coin to Logan Evans, son of late U.S. Capitol Police officer William "Billy" Evans, during a memorial service as Evans lies in honor in the Rotunda at the U.S. Capitolin Washington, DC, U.S. April 13, 2021. Drew Angerer/Pool via REUTERS

A U.S. Capitol police officer watches from inside the U.S. Capitol prior to a ceremony honoring fellow officer William Evans, who was killed on April 2 and will lie in honor in the Capitol rotunda in Washington, U.S., April 13, 2021.

A law enforcement officer wait to pay respects to Officer William (Billy) Evans, an 18-year U.S. Capitol Police veteran who died in the line of duty on April 2, at the U.S. Capitol in Washington, U.S. April 13, 2021.

Sen. Susan Collins (R-ME) holds a program during a memorial service for the late U.S. Capitol Police officer William "Billy" Evans as he lies in honor in the Rotunda at the U.S. Capitol in Washington, DC, U.S. April 13, 2021. Drew Angerer/Pool via REUTERS

The family of late U.S. Capitol Police officer William "Billy" Evans, wife Shannon Terranova, their nine-year-old son Logan and seven-year-old daughter Abigail, watch the casket of Officer Evans being carried by a joint service honor guard down the East Front steps of the U.S. Capitol after lying in honor in the Capitol Rotunda, in Washington, U.S. April 13, 2021. Michael Reynolds/Pool via REUTERS

U.S. Vice President Kamala Harris pays her respects to the late U.S. Capitol Police officer William "Billy" Evans as he lies in honor in the Rotunda at the U.S. Capitol in Washington, DC, U.S. April 13, 2021. Drew Angerer/Pool via REUTERS

Children of the late U.S. Capitol Police officer William "Billy" Evans, Logan and Abigail, are comforted by their mother Shannon?Terranova during a memorial service as Evans lies in honor in the Rotunda at the U.S. Capitol in Washington, DC, U.S. April 13, 2021. Drew Angerer/Pool via REUTERS

Officers watch as the casket of Capitol Police Officer William "Billy" Evans arrives to lay in Honor on Capitol Hill in Washington, DC, U.S. April 13, 2021. Jabin Botsford/Pool via REUTERS

Law enforcement officers wait to pay respects to Officer William (Billy) Evans, an 18-year U.S. Capitol Police veteran who died in the line of duty on April 2, at the U.S. Capitol in Washington, U.S. April 13, 2021.

Abigail Evans, the daughter of U.S. Capitol Police officer William Evans who was killed in the line of duty on April 2, watches as his casket is carried into the U.S. Capitol in Washington, U.S., April 13, 2021.

A U.S. Capitol Police officer pays respects to the late Officer William "Billy" Evans as the casket carrying his remains lies in honor in the Capitol Rotunda in Washington, U.S. April 13, 2021. Jacquelyn Martin/Pool via REUTERS

A casket containing the remains of late U.S. Capitol Police officer William Evans, who was killed in the line of duty on April 2, is carried as it departs the U.S. Capitol following ceremonies in his honor in Washington, U.S., April 13, 2021.

Members of the U.S. National Guard line Independence Avenue as the hearse containing the remains of the late U.S. Capitol Police officer William Evans, who was killed in the line of duty on April 2, is escorted up Capitol Hill to a ceremony honoring the officer at the U.S. Capitol

The casket of late U.S. Capitol Police officer William "Billy" Evans is carried by a joint service honor guard down the East Front steps of the U.S. Capitol after lying in honor in the Capitol Rotunda, in Washington, U.S. April 13, 2021. Michael Reynolds/Pool via REUTERS

U.S. Speaker of the House Nancy Pelosi, Senate Majority Leader Chuck Schumer, House Majority Leader Steny Hoyer, and Republican Representative of Louisiana Steve Scalise, watch with U.S. Capitol Police officers as the casket of late U.S. Capitol Police officer William "Billy" Evans is carried by a joint service honor guard down the East Front steps of the U.S. Capitol after lying in honor in the Capitol Rotunda, in Washington, U.S. April 13, 2021. Michael Reynolds/Pool via REUTERS

Law enforcement officers stand at attention as the casket containing the remains of late U.S. Capitol Police officer William Evans, who was killed in the line of duty on April 2, departs the Capitol following ceremonies honoring Evans in Washington, U.S., April 13, 2021

U.S. President Joe Biden rubs his eye during a memorial for the late U.S. Capitol Police officer William "Billy" Evans as he lies in honor in the Rotunda at the U.S. Capitol in Washington, DC, U.S. April 13, 2021. Drew Angerer/Pool via REUTERS

Capitol Police officer William ?Billy? Evans arrives to lie in honor in the Rotunda of the U.S. Capitol in Washington, DC, U.S. April 13, 2021. Mandel NGAN/Pool via REUTERS

U.S. President Joe Biden pays respects to U.S. Capitol Police Officer William "Billy" Evans, as his remains lie in honor in the Capitol Rotunda in Washington, D.C., U.S. April 13, 2021. Tom Williams/Pool via REUTERS

A U.S. Capitol Police honor guard surrounds the casket containing the remains of late U.S. Capitol Police officer William "Billy" Evans as it lies in honor in the Capitol Rotunda in Washington, U.S. April 13, 2021. Jacquelyn Martin/Pool via REUTERS

A large group of Capitol Police officers surround the casket of the late U.S. Capitol Police officer William "Billy" Evans during a memorial service as Evans lies in honor in the Rotunda at the U.S. Capitol in Washington, DC, U.S. April 13, 2021. Drew Angerer/Pool via REUTERS

The funeral procession of U.S. Capitol Police Officer William (Billy) Evans, who was killed in the line of duty on April 2, departs after he was honored at the U.S. Capitol in Washington, U.S., April 13, 2021.

The casket of U.S. Capitol Police Officer William "Billy" Evans is carried by a joint service honor guard into the U.S. Capitol in Washington, DC, U.S. 13 April 2021. Shawn Thew/Pool via REUTERS

Children of the late U.S. Capitol Police officer William "Billy" Evans, Logan and Abigail, sit with their mother Shannon?Terranova, and Evans' mother Janice Evans (R), during a memorial service as Evans lies in honor in the Rotunda at the U.S. Capitol in Washington, DC, U.S. April 13, 2021. Drew Angerer/Pool via REUTERS

Capitol Police officers embrace after paying their respects at the casket of the late U.S. Capitol Police officer William "Billy" Evans during a memorial service as Evans lies in honor in the Rotunda at the U.S. Capitol in Washington, DC, U.S. April 13, 2021. Drew Angerer/Pool via REUTERS

U.S. House Speaker Nancy Pelosi greets the family of slain U.S. Capitol Police officer William “Billy” Evans, including Janice Evans, from left, Logan Evans, Abigail Evans, and Shannon Terranova, during a ceremony in the Rotunda at the Capitol in Washington, DC, U.S., April 13, 2021. J. Scott Applewhite/Pool via REUTERS

Capitol Police Officer Eugene Goodman pays his respects to the late U.S. Capitol Police officer William "Billy" Evans as he lies in honor in the Rotunda at the U.S. Capitol in Washington, DC, U.S. April 13, 2021. Drew Angerer/Pool via REUTERS

The the casket containing the remains of late U.S. Capitol Police officer William Evans, who was killed in the line of duty on April 2, departs the Capitol following ceremonies honoring Evans in Washington, U.S., April 13, 2021.

U.S. Capitol Police officers react after the departure of the casket of late fellow Capitol Police officer William Evans, who was killed in the line of duty on April 2, at the U.S. Capitol following ceremonies honoring Evans in Washington, U.S., April 13, 2021.

U.S. Capitol Police officers and family members of late fellow Capitol Police officer William Evans, who was killed in the line of duty on April 2, wait for the departure of the casket at the U.S. Capitol following ceremonies honoring Evans in Washington, U.S., April 13, 2021.

The casket of Capitol Police Officer William "Billy" Evans arrives to lay in Honor on Capitol Hill in Washington, DC, U.S. April 13, 2021. Jabin Botsford/Pool via REUTERS

Logan Evans, son of slain U.S. Capitol Police officer William “Billy” Evans, walks past the casket during a ceremony at the Capitol in Washington, DC, U.S., April 13, 2021. J. Scott Applewhite/Pool via REUTERS

Members of a Capitol Police honor guard salute at the casket of the late U.S. Capitol Police officer William "Billy" Evans during a memorial service as Evans lies in honor in the Rotunda at the U.S. Capitol in Washington, DC, U.S. April 13, 2021. Drew Angerer/Pool via REUTERS

U.S. Capitol Police Acting Chief Yogananda Pittman, pays respects to Capitol Police Officer William "Billy" Evans, as his remains lie in honor in the Capitol Rotunda in Washington, D.C., U.S. April 13, 2021. Tom Williams/Pool via REUTERS

A U.S. Capitol Police Honor Guard switches off duty as U.S. Capitol Police officer William Evans lies in honor at the U.S. Capitol in Washington, D.C., U.S. April 13, 2021. Greg Nash/Pool via REUTERS

A motorcycle convoy of law enforcement officers escort the casket containing the remains of late U.S. Capitol Police officer William Evans, who was killed in the line of duty on April 2, departing the Capitol following ceremonies honoring Evans in Washington, U.S., April 13, 2021.