BRANDON, Miss. -- An ex-martial arts instructor made ricin and put the poison in letters to President Barack Obama and others, the FBI charged Saturday, days after dropping similar charges against an Elvis impersonator who insisted he had been framed.

The arrest of 41-year-old James Everett Dutschke early Saturday capped a week in which investigators initially zeroed in on a rival of Dutschke's, then decided they had the wrong man. The hunt for a suspect revealed tie after small-town tie between the two men and the 80-year-old county judge who, along with Obama and U.S. Sen. Roger Wicker of Mississippi, was among the targets of the letters.

Dutschke's house, business and vehicles in Tupelo were searched earlier in the week by crews in hazardous materials suits and he had been under surveillance.

Dutschke [pronounced DUHS'-kee] was charged with "knowingly developing, producing, stockpiling, transferring, acquiring, retaining and possessing a biological agent, toxin and delivery system, for use as a weapon, to wit: ricin." U.S. attorney Felicia Adams and Daniel McMullen, the FBI agent in charge in Mississippi, made the announcement in a news release Saturday.

Dutschke's attorney, Lori Nail Basham, said she had no comment. Earlier this week she said Dutschke was cooperating fully with investigators, and Dutschke has insisted he had nothing to do with the letters. He was arrested about 12:50 a.m. at his house in Tupelo and is expected in court Monday. He faces up to life in prison, if convicted.

The letters, which tests showed were tainted with ricin, were sent April 8 to Obama, Wicker and a Mississippi judge, Sadie Holland.

Wicker spokesman Ryan Taylor said since the investigation was ongoing, the senator couldn't comment.

The first suspect fingered by the FBI was Paul Kevin Curtis, 45, an Elvis impersonator. He was arrested on April 17 at his Corinth, Miss., home. The charges were dropped six days later and Curtis, who said he was framed, was released from jail.

Federal authorities, some in hazmat suits, walk outside the staging area as they search at a small retail space where neighboring business owners said Everett Dutschke used to operate a martial arts studio, in connection with the recent ricin attacks, Wednesday, April 24, 2013 in Tupelo, Miss. No charges have been filed against Dutschke and he hasn´t been arrested. (AP Photo/Rogelio V. Solis)

The focus then turned to Dutschke, who has ties to the former suspect, the judge and the senator. Earlier in the week, as investigators searched his primary residence in Tupelo, Dutschke said, "I don't know how much more of this I can take."

"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 on 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' sign-off 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.

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 said he did.

On Saturday, Steve Holland said he can't say for certain 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 said.

He said he's not sure why someone would target his mother.

"Maybe he thinks the best way to get to me is to get to the love of my life, which is my mother," Holland said.

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Associated Press writer Jack Elliott Jr. in Jackson contributed to this report.

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