Keller was identified as a participant in the
2021 United States Capitol attack, where he was seen inside the
Capitol rotunda in a crowd of people clashing with police officers. Keller's presence was reported by several people who saw a video posted by conservative outlet
Townhall. Some of the people who recognized Keller in the video said that he had frequently posted pro-Trump content on his
social-media accounts. Keller deleted his social-media accounts after being identified. He was recognized, in part, because of his height, the fact that he was wearing a U.S. Olympic team jacket, and that his face was unobstructed in the video. On January 13, 2021, for his involvement in the storming of the Capitol, the
FBI charged Keller with obstructing law enforcement engaged in official duties,
unlawfully entering Capitol grounds, and
disorderly conduct on Capitol grounds. For those charges, he originally faced up to 15.5 years in prison. He surrendered himself the next day and federal agents executed a
search and seizure warrant on his home. Keller was released from custody the same day on a personal recognizance bond. A
grand jury would decide whether more serious charges were warranted. On February 10, the grand jury indicted Keller on seven charges, including
civil disorder,
obstructing an official proceeding, entering a restricted building, disorderly conduct in a restricted building, and disorderly conduct in a Capitol building. The charges had a maximum sentence of nearly 30 years. On March 9, 2021, Keller pleaded not guilty to seven charges, including civil disorder and
witness tampering. On September 29, 2021, as part of a
plea bargain, Keller pleaded guilty to a felony count of
obstructing an official proceeding before Congress. He also pledged to cooperate with any continuing investigation into the attack. The felony carried a maximum potential sentence of 20 years. In his guilty plea, he admitted to spending roughly an hour in the United States Capitol building. He admitted that, in the Capitol Rotunda, he shouted "Fuck
Nancy Pelosi!" and "Fuck
Chuck Schumer!", captured video and photographs, and "jerked his elbow" to avoid law enforcement officers that were trying to eject him from the building. In December 2022, Keller was free on bond pending his sentencing. He faced 21 to 27 months in prison and sentencing was set for July 7, 2023. On June 15, 2023, Keller requested a postponement of his sentencing hearing so he could "further facilitate" his cooperation with the ongoing investigation into the Capitol attack. Sentencing was postponed until December 1, 2023. On November 17, the U.S. government requested a 10-month sentence for Keller, shorter than the guideline of 21–27 months in similar cases. On December 4, 2023, Keller received a sentence of six months home detention and three years probation. On January 20, 2025, Keller received a full pardon by President Donald Trump. ==Personal life==