Timothy Koebert was nearing the end of his prison term for arson at the Pennsylvania State Correctional Institute when he mailed six letters—three to the IRS, three to an Assistant U.S. Attorney—on various dates in 2021 and 2022.

Koebert knowingly threatened to assault a federal law enforcement officer with intent to impede, intimidate, and interfere with him while he was engaged in the performance of official duties and with intent to retaliate against him on account of his performance of official duties.

Koebert mailed a letter that contained a threat to injure an unnamed female victim to the IRS in Austin, TX. Koebert also mailed a letter containing a threat to injure multiple victims, including an unnamed law enforcement officer to the IRS in Ogden, UT.

In August 2025, in the Middle District of Pennsylvania, Koebert pleaded guilty to a nine-count indictment for mailing threatening communications and threats to a federal law enforcement officer