By Lisa Bose McDermott
TEXARKANA, Texas (Reuters) - A Texas actress pleaded guilty on Tuesday to making the toxic agent ricin that was sent in letters to President Barack Obama and New York Mayor Michael Bloomberg.
As part of a deal reached with federal prosecutors that has yet to be approved by a judge, Shannon Guess Richardson, 36, would spend 18 years in prison and then five years on supervised release, according to court documents.
Richardson, whose career included minor television roles in shows such as "The Walking Dead," tried to blame her husband for the letters that were sent in May, according to prosecutors.
The letters read, in part: "You will have to kill me and my family before you get my guns. Anyone wants to come to my house will get shot in the face," according to court documents.
In a court document signed by Richardson, she outlines how she extracted the toxin using castor beans, lye and syringes that she bought with her husband's credit card.
The New Boston, Texas, woman was initially charged with one count of making a threat against the president of the United States and two counts of mailing threatening communications with each charge carrying as much as five years in prison.
The new charges of manufacturing and possessing the toxic substances carry as much as life in prison.
Richardson was arrested in June and a federal grand jury accused her in a three-count indictment of mailing the letters to Obama, Bloomberg and Mark Glaze, the director of Mayors Against Illegal Guns, a group founded by Bloomberg that lobbies for stricter gun laws.
Ricin, a highly toxic substance, is found naturally in castor beans, but it takes a deliberate act to manufacture it and use it to poison people, according to the U.S. Centers for Disease Control and Prevention.
Exposure to even a small amount of ricin can cause death and no known antidote exists.
(Editing by Jon Herskovitz, Gunna Dickson and Lisa Shumaker)
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