According to court documents obtained by NBC News, police made contact with Hoyt after an October 911 call. Hoyt, who had recently been fired from his job, told an officer that he was Jesus Christ and that he planned to kill Boehner, adding that he believed the Ohio congressman was responsible for the Ebola outbreak.
He was taken to a hospital for psychiatric evaluation. A .380 handgun was recovered from his residence.
More from NBC News:
Margaret Cho Responds to Critics of Her Golden Globes Cameo
Ex-Wife of Oil Tycoon Harold Hamm Cashes $975m Check, Seeks More
ISIS Video Appears to Show Child Soldier Executing Two Men
Boehner would not comment to reporters about the plot when leaving the Capitol Tuesday night, but his office released a statement thanking authorities.
"Speaker Boehner is aware of this situation, and sincerely thanks the FBI, the Capitol Police, and local authorities in Ohio for their efforts," said Boehner spokesman Michael Steel.
Hoyt was initially charged in November, and the case was unsealed last month. It attracted attention Tuesday when the grand jury indictment was filed.
When the charges were initially filed in November, Capitol Police said even though Hoyt was hospitalized, they worried he might be released. In mid-December, a federal judge ordered him to undergo a 45-day mental examination.