Lt. Gov. Burt Jones of Georgia will not be criminally charged for acting as a fake elector for Donald J. Trump in 2020, when he was a state senator, a special prosecutor announced on Friday.

The decision not to indict Mr. Jones was made by Pete Skandalakis, a veteran Georgia prosecutor who, like the lieutenant governor, is a Republican. It is a major victory for Mr. Jones, who is a prominent and unflagging Trump supporter and may run for governor in 2026.

But the prosecutor’s findings included an implicit rebuke of the Trump legal team. In a statement released Friday afternoon, Mr. Skandalakis said that lawyers for Mr. Trump had “continued to make false and misleading statements regarding the election results,” even after the state’s top officials had said there was no evidence of widespread fraud sufficient to change the result of Georgia’s election.

Mr. Jones was originally investigated by Fani T. Willis, a Democrat who is the Fulton County district attorney, as part of her inquiry into efforts to overturn Mr. Trump’s election loss in Georgia. But in 2022 a judge disqualified Ms. Willis from developing a case against Mr. Jones because she had hosted a fund-raiser for a political rival of his.

Mr. Skandalakis, as head of a state entity called the Prosecuting Attorneys’ Council of Georgia, was then required by law to find a replacement prosecutor to determine whether Mr. Jones should be charged. He took nearly two years to do so, and ended up deciding that he himself would be the best person for the job. He took another five months to conclude that Mr. Jones should not be prosecuted.

“My review of the evidence finds this matter does not warrant further consideration,” Mr. Skandalakis said in his statement on Friday. “The evidence reveals Senator Jones acted in a manner consistent with his position representing the concerns of his constituents and in reliance upon the advice of attorneys when he served as an alternate elector. The evidence also indicates Senator Jones did not act with criminal intent, which is an essential element of committing any crime.”

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