"I'm a patriotic American. I don't have any grudges against anybody. ... I did not send the letters," Dutschke said.
Curtis' attorney, Christi McCoy, said Saturday: "We are relieved but also saddened. This crime is nothing short of diabolical. I have seen a lot of meanness in the past two decades, but this stops me in my tracks."
Some of the language in the letters was similar to posts on Curtis' Facebook page and they were signed, "I am KC and I approve this message." Curtis' signoff online was often similar.
Dutschke and Curtis were acquainted. Curtis said they had talked about possibly publishing a book on a conspiracy that Curtis insists he has uncovered to sell body parts on a black market. But he said they later had a feud.
Curtis' attorneys have said they believe their client was set up. An FBI agent testified that no evidence of ricin was found in searches of Curtis' home. Curtis attorney Hal Neilson said the defense gave authorities a list of people who may have had a reason to hurt Curtis and Dutschke came up.
Judge Holland also is a common link between the two men, and both know Wicker.
Holland was the presiding judge in a 2004 case in which Curtis was accused of assaulting a Tupelo attorney a year earlier. Holland sentenced him to six months in the county jail. He served only part of the sentence, according to his brother.
And Holland's family has had political skirmishes with Dutschke. Her son, Steve Holland, a Democratic state representative, said he thinks his mother's only other encounter with Dutschke was at a rally in the town of Verona in 2007, when Dutschke ran as a Republican against Steve Holland.
Holland said his mother confronted Dutschke after he made a derogatory speech about the Holland family. She demanded that he apologize, which Holland says he did.
On Saturday, Steve Holland said he can't say for certain that Dutschke is the person who sent the letter to his mother but added, "I feel confident the FBI knows what they are doing."
"We're ready for this long nightmare to be over," Holland told AP.