Karate Instructor Suspected of Set-Up in Ricin Investigation

The first and second suspects in the case have been in a online battle since 2007.
1:55 | 04/25/13

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Transcript for Karate Instructor Suspected of Set-Up in Ricin Investigation
Now, new developments in the mystery of who sent letters laced with lethal poison to the president and top officials. The investigation focused first on an el vision impersonator from tupelo, mississippi. Now, the focus is on another man from his hometown. And it turns out the two of them have been feuding for years. Abc's matt gutman has that story for us. Reporter: I've never seen anything this blown out of proportion. Reporter: This morning, we're hearing for the first time from the martial arts instructor, apparently connected to the ricin letter scare that terrorized washingst week. Everybody has something suspicion in their house. But, no. There's nothing that's related to these letters. Reporter: Federal hazmat teams, space suits and all, descended on dutschke's apartment and studio. His is the second life scrutinized by the fbi in just a week. Authorities had charged that elvis impersonator, kevin curtis, was threatening the president, before dropping those charges late tuesday. When you've been charged with something, and you never heard of, ricin or whatever. I thought they said rice. I don't even eat rice. Reporter: We caught up with him late wednesday. Something happened the last minute. It was a turn of events. Information they got and they couldn't tell me. I still don't know. Reporter: You still don't know? I don't know. Reporter: His lawyer does. Hinting dutschke flamed curtis. I think anything bad that's happened in his life the last few years, he's somehow managed to believe that he is responsible. Reporter: The two have been in a twitter and youtube war since 2007. Instead of wanting to defend her client, she said, that guy did it. Reporter: Dutschke's attorney tells abc news, if authorities don't find traces of ricin at his properties, the cloud of suspicion over him should be lifted, too. For "good morning america," matt gutman, abc news, tupelo, mississippi.

This transcript has been automatically generated and may not be 100% accurate.

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