'Walking Dead,' 'Vampire Diaries' actress arrested in ricin case

 (CNN) -- A Texas actress has been arrested in connection with allegedly ricin-tainted letters that were mailed last month to President Barack Obama and New York City Mayor Michael Bloomberg, federal law enforcement sources said Friday.

Investigators believe Shannon Rogers Richardson, also known as Shannon Rogers Guess, mailed the letters, a law enforcement official with knowledge of the investigation said.

The letters to Obama, Bloomberg and to an anti-illegal-gun foundation that Bloomberg founded were mailed from Shreveport, Louisiana, last month, federal authorities say.

Richardson is an actress who has had with minor roles in television series like "The Walking Dead" and "The Vampire Diaries."

--Joe Johns, Susan Candiotti and Carol Cratty, CNN

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