On Sept. 14 of last year, a federal judge received a one-page letter that read, in part, “BOOM see how easy this was, next time you wont be so lucky ERM Family ANTHRAX!!"

According to the indictment, the letter also said: "I just hope Allah grants me the opportunity to be the one who chops off your head," and the words "die die die!!!" followed by the sentence "If I ever ever get out I promise you I'm coming after you."

The letter wasn't signed but the FBI quickly found Willie Ray Bryant's prints on it. The 41-year-old was in prison in Cumberland; the judge had presided over one of his previous trials in state court. According to on-line records, the judge had overseen a case in which Bryant pleaded guilty to a handgun charge in 2001 and sentenced him to five years in prison.

The FBI also said they found "the letter also bore imprints of letters and numbers appearing to partially match Bryant's mother’s name and phone number," according to federal prosecutors.

The Maryland U.S. Attorney's Office said in a statement:

"After the FBI determined the sender’s identity from Bryant’s fingerprints, a message was sent to Maryland Corrections officials to monitor Bryant's use of the mail.  Shortly thereafter, corrections officials intercepted a letter Bryant had addressed to President Obama excoriating the President for turning his back on Islam and threatening to kill the President. Bryant signed the letter and included his state prisoner number."

He faces 10 years in prison when he is sentenced Dec. 9.