An Oath Keepers member has admitted to engaging in seditious conspiracy during the January 6, 2021, attack on the US Capitol and agreed to cooperate with investigators, handing a win to prosecutors as they prepare for a likely trial against the group's founder.
Brian Ulrich, 44, of Georgia pleaded guilty on Friday during a court hearing in federal court in the District of Columbia.
Ulrich was one of 11 Oath Keepers members charged with seditious conspiracy in an indictment unsealed in January.
The defendants in that case include Stewart Rhodes, the founder of the militia group.
Some of those defendants are likely heading to trial later this year.
That multi-defendant case is the only case alleging participants in the January 6 attack engaged in seditious conspiracy, which is defined as attempting "to overthrow, put down or to destroy by force the government of the United States".
Ulrich is the second Oath Keepers member to plead guilty to seditious conspiracy and obstruction charges.
Joshua James, 34, of Alabama pleaded guilty in March.
As part of the plea agreement, Ulrich has agreed to co-operate with the US Justice Department's ongoing investigation.
Under US sentencing guidelines, Ulrich faces a likely sentence of about six years in prison, with credit for time already served.
US District Judge Amit Mehta, who will sentence Ulrich, is not bound by that guideline range.
A sentencing hearing has not yet been set and Ulrich will be in federal custody until that hearing.