Over a year ago, two off-duty police officers from a small town in Virginia were charged with storming the U.S. Capitol together. A trial for one of them starts this week. The other could be a key prosecution witness.

The trial of former Rocky Mount police officer Thomas Robertson will be the third among hundreds of people charged in the Jan. 6, 2021, attack on the Capitol. The first two trials both ended with convictions, although one of those defendants was acquitted of a disorderly conduct charge.

Jury selection for Robertsons trial is scheduled to start Monday in Washington, D.C. One of his former colleagues, Jacob Fracker, was scheduled to join him on trial. Instead, Fracker reached a plea deal and agreed to cooperate with federal authorities.

Fracker pleaded guilty last month to conspiring to obstruct an official proceeding, the joint session of Congress that convened Jan. 6 to certify President Joe Biden s electoral victory.

Robertson is charged with six counts, including obstruction of an official proceeding, civil disorder, entering and remaining in a restricted building and disorderly conduct in a Capitol building.

Robertson and Fracker both served as police officers in Rocky Mount, a town about 25 miles south of Roanoke with roughly 5,000 residents. The town fired both of them after their arrests.

Other former police officers are among the hundreds of people charged with joining the mob that stormed the Capitol riot.