Richardson has been married three times. Since October 8, 2011, she has been married to Nathan Richardson, a U.S. Army veteran who works as a mechanic in a military depot.
As of June 2013[update], Richardson had five children, ranging in age from 4 to 19, and was pregnant with another; none of them are fathered by Nathaniel Richardson, her current husband. On July 4, 2013, Richardson gave birth to a baby boy named Brody while in custody. Officials said that the baby was born four months prematurely, and was only two pounds, and he needs to remain hospitalized. In August 2013, Nathan Richardson won temporary custody of Brody.
Ricin poisoning attempt
In May 2013, while going through a divorce, Richardson called the police and accused her husband of mailing letters laced with the poison ricin to several politicians.
Nathan Richardson has not been charged with any crime. He told investigators that his wife set him up. Investigators found evidence that Shannon Richardson mailed the ricin laced letters herself, in an effort to set up her estranged husband.
Shannon Richardson was arrested on June 7, 2013 for her alleged involvement in ricin-laced letters sent to politicians including President Barack Obama and New York City mayor Michael Bloomberg. She was charged with "mailing a threatening letter to President Barack Obama". On June 6, she confessed that she had mailed the three letters, knowing they contained ricin, but claimed her husband made her do it.
By June 15, 2013, Richardson's star meter was No. 1 on IMDb, Internet Movie Database, and had been for several days. 
On June 20, 2013, a federal judge ordered Richardson be given a psychological examination, based on a request from her court-appointed attorney, who said she had shown "a pattern of behavior" that raised questions about her ability to assist in her own criminal defense.
On November 22, Shannon Richardson reached a plea agreement and faces up to five years' imprisonment on each of three counts. On December 10, she pled guilty and was sent to the Texas State Prison System where she faces up to eighteen years.