At the time of her arrest in June 2013, Richardson had five children, ranging in age from 4 to 19 with her two previous husbands and was pregnant with her sixth child. On July 4, 2013, Richardson gave birth to a boy, named Brody, while in custody. Officials said that the baby was born four months prematurely, weighed only two pounds at birth, and that he needed to remain hospitalized. In August 2013, Nathan Richardson won temporary custody of Brody.
In May 2013, while going through a divorce, Richardson called the police and falsely accused her husband, Nathan Richardson, of mailing letters laced with the poison ricin to several politicians. Nathan Richardson was never charged in regard to the matter. He told investigators that his wife set him up. Investigators found evidence that she had mailed the ricin-laced letters herself in an effort to set up her estranged husband.
Richardson was arrested on June 7, 2013, for her alleged involvement in ricin-laced letters being sent to politicians such as President Barack Obama and New York City mayor Michael Bloomberg. She was charged with "mailing a threatening letter to President Barack Obama".