(KTBS) -The New Boston, Texas, woman accused of mailing ricin-laced letters to President Barack Obama and others has negotiated a plea agreement.
Shannon Guess Richardson's case docket includes a one-line "notice of plea agreement" written Thursday by Assistant U.S. Attorney Frank Coan.
A docket entry in Richardson's case cancels a pretrial hearing set for Dec. 2 before U.S. District Judge Michael Schneider.
Plea agreement details are typically not public record until sentencing. A date for Richardson to appear in court and formally change her plea to guilty has not been set.
Richardson has been in the custody of federal marshals since June. A federal grand jury handed down a three-count indictment charging her with making a threat against the president of the United States and two counts of mailing threatening communications