A federal judge has again thrown out securities fraud charges against Texas Attorney General Ken Paxton, effectively ending one of two legal battles that have dogged Paxton for close to a year. 

U.S. District Judge Amos Mazzant on Thursday dismissed the case "with prejudice," making a final judgment on the charges that had been brought by the U.S. Securities and Exchange Commission. Mazzant first threw out the charges last year but gave the SEC the opportunity to file amended allegations — which it did in October, keeping the case alive. 

Paxton is accused of misleading investors in a company from before his time as the state's top lawyer. He is fighting similar, criminal charges at the state level, where he is set to go to trial in May. That case is more serious, holding the potential for a sentence of up to 99 years in prison. 

In its amended allegations, the SEC had sought to bolster its argument that Paxton had a legal duty to disclose to the investors that he was making a commission. Mazzant said Thursday the SEC had not been persuasive enough. 

"This case has not changed since the Court conditionally dismissed the Commission’s Original Complaint," the judge wrote. "The primary deficiency was, and remains, that Paxton had no plausible legal duty to disclose his compensation arrangement with investors." 

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