( CNN ) -- A federal judge determined Wednesday that Shannon Richardson , an actress accused of sending ricin-laced letters to President Barack Obama and New York Mayor Michael Bloomberg , is a `` flight risk '' and thus must remain behind bars . The Texas woman , also known as Shannon Rogers and Shannon Guess , was arrested in June . She was ordered to undergo a mental evaluation , and late last month , she was found competent to stand trial . The actress has pleaded not guilty on all counts . Richardson was in a federal court in Texarkana , Texas , for a roughly 30-minute detention hearing Wednesday morning . According to a court document , her lawyer and prosecutors both presented their arguments as to why she should be allowed to go free on bail or , conversely , why she should remain in custody . Judge Caroline Craven concluded that , although Richardson probably is n't `` a danger to the community , '' she is `` a serious flight risk , and no conditions will ensure her appearance . '' As a result , Craven ordered the 35-year-old to remain detained pending her trial . Three envelopes containing the natural , highly toxic compound derived from castor beans were mailed from Shreveport , Louisiana , in May . They were discovered , before causing any injuries or fatalities , with what the FBI described as `` very low concentrations '' of ricin . What is ricin ? Richardson -- who has had minor roles in television series including `` The Walking Dead '' and `` The Vampire Diaries '' -- initially told FBI agents that her now-estranged husband Nathaniel had sent the ricin-tainted letters . But , authorities have said , Richardson was found to be `` deceptive '' in a polygraph exam . Investigators found that her computer storage devices contained the text of threatening letters sent to the president . But the couple 's computer records show that her husband could n't have printed them out because he was at work at the time , according to an FBI arrest affidavit . Eventually , Richardson admitted to investigators that she 'd mailed the letters , though she claimed her husband had typed them out and forced her to print and mail them , the affidavit said . Actress first accuses husband , then is arrested in ricin case . Nathaniel Richardson denied doing any such thing , telling investigators that his wife was `` intentionally misleading '' them and that she 'd wanted to end their marriage and leave them , court papers said . He filed for divorce in June , and court papers indicated that Shannon Richardson was pregnant .
A federal judge says Shannon Richardson is n't a danger to the community . But the judge says `` no conditions will ensure her appearance '' again in court . She 's pleaded not guilty to sending ricin-tainted letters to Obama and NYC mayor . Richardson has had minor roles in TV series including `` The Walking Dead ''