TODAY | April 28, 2013
>>> a mississippi man is behind bars this morning accused of sending ricin-laced letters to president obama as well as others. janet shamlian has that story.
>> reporter: federal agents arrested karate teacher everett dutschke at his mississippi home, the latest chapter in a bizarre investigation, after ricin-laced letters were sent to president obama and others. dutschke is charged with possessing a biological agent with the intent to use as a weapon. when his house was searched last week, he denied having been involved.
>> i had absolutely nothing to do with those letters, and the person accused of sending those letter, her defense attorney -- or his defense attorney said -- steered them in my direction, because i was probably an easy target.
>> reporter: paul kevin curtis was initially arrested for sending the letters. he was held six days before charges were abruptly dropped and he was freed. curtis and dutschke had a tangled relationship.
>> when you get the wrong guy, the public is confused, and it starts to break down confidence in law enforcement .
>> reporter: if convicted, dutschke could face life in prison . for "today," janet shamlian , nbc news, houston.