Texas actress Shannon Guess Richardson, who is accused of mailing ricin-laced letters to President Barack Obama and New York Mayor Michael Bloomberg, has reached a plea deal with federal prosecutors, according to federal court documents.
Shannon Guess Richardson, 36, whose acting career included minor television roles, had attempted to blame her husband for sending the letters in May that tested positive for the presence of ricin, according to prosecutors.
Notice of the plea deal was filed on Thursday in US District Court for the Eastern District of Texas.
Shannon Guess Richardson is accused of mailing ricin-laced letters to President Barack Obama and NY Mayor Michael Bloomberg
Shannon Guess Richardson was arrested in June and a federal grand jury accused her in a three-count indictment of mailing the letters to Barack Obama, Michael 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 make ricin and use it to poison people, according to the CDC. Exposure to even a small amount can cause death and no known antidote exists.
Shannon Guess Richardson is charged with one count of making a threat against the president of the US and two counts of mailing threatening communications. She faces up to five years in prison on each count if convicted.
According to court documents, 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.”
A letter posted to Mississippi Republican Senator Roger Wicker at the US Senate has been tested positive for the lethal toxin ricin or another poisonous substance, Senate Majority Leader Harry Reid has said.
The letter was intercepted at a centre handling post for the Capitol in Washington DC, US media report.
Ricin, extracted from castor beans, is 1,000 times more toxic than cyanide.
It can be fatal when inhaled, swallowed or injected, although it is possible to recover from exposure.
Roger Wicker issued a statement on Tuesday acknowledging the letter.
“This matter is part of an ongoing investigation by the United States Capitol Police and FBI,” he said.
“I want to thank our law enforcement officials for their hard work and diligence in keeping those of us who work in the Capitol complex safe.”
An official quoted by AP news agency said two tests had shown positive for ricin but the results are not deemed conclusive without further testing.
A letter posted to Mississippi Republican Senator Roger Wicker at the US Senate has been tested positive for the lethal toxin ricin or another poisonous substance
The letter was detected during a routine inspection of mail and did not reach the US Capitol or Senator Roger Wicker’s office, a Senate leadership aide was quoted as saying.
Senators were informed of the letter at a closed-door briefing by FBI Director Robert Mueller and Homeland Security Secretary Janet Napolitano about the Boston Marathon bombings, the aide added.
There is a heightened sense of alert in the US capital after the attacks in Boston but there is no indication so far of any connection between the two incidents.
It is also not clear why the letter was sent to Senator Roger Wicker.
The Senate’s chief security office told Reuters: “The exterior marking on the envelope in this case was not outwardly suspicious, but it was postmarked from Memphis, Tennessee.”
All mail sent to members of Congress has been screened off-site since letters laced with anthrax were sent to Capitol Hill in 2001.
In 2004, three Senate office buildings were shut after tests found ricin in letters that had been sent to the Senate majority leader’s office.
Ricin was the poison used for the infamous murder of Bulgarian dissident Georgi Markov in September 1978.
Georgi Markov was waiting at a bus stop near Waterloo Bridge, London, when a stranger jabbed him in the leg with an umbrella.
The umbrella injected a tiny ricin-filled pellet into Georgi Markov’s leg and he died three days later in hospital.
Can be fatal when inhaled, ingested or – most dangerously – injected
One to three castor beans chewed by a child, or just eight seeds chewed by an adult, can be fatal
The toxin is part of the waste produced when castor oil is made
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