Jacob Chansley, the horned and face-painted “QAnon shaman” who instantly became one of the most visible and recognizable figures storming the Capitol and the Senate chamber in the January 6 riot, entered a guilty plea for his role in the siege.

Chansley, also known as Jacob Angeli, entered a guilty plea of obstruction of a federal proceeding, a felony, in a plea deal with prosecutors.

“You are in fact guilty of this offense?” U.S. District Judge Royce Lamberth asked.

“Yes, your honor,” Chansley said.

Prosecutors said that sentencing guidelines range from 41 to 61 months. Chansley has served eight months in incarceration, which could be credited to the sentence.

On Jan. 6, Chansley was bare chested and wore a horned helmet, face paint and furs as he participated in the siege of the Capitol. He was initially charged in a six-count indictment, which also included civil disorder, violent entry and disorderly conduct.

His attorney,...