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ST. LOUIS — The St. Louis grand jury that indicted a former FBI agent has disbanded without a second indictment, but an investigation involving Circuit Attorney Kimberly M. Gardner's office is continuing, sources tell the Post-Dispatch.

The special grand jury, empaneled eight months ago to investigate allegations of perjury and other crimes in connection with last year's invasion-of-privacy case against former Gov. Eric Greitens, disbanded Monday evening, having indicted one person: William Don Tisaby.

Tisaby is a private investigator Gardner hired to look into claims that Greitens snapped an iPhone photo of a semi-nude woman in 2015 without her consent and threatened to share it if she exposed their affair.

A continuing investigation into Gardner's office means a special prosecutor soon may request another grand jury to review evidence and reveal more about how Gardner's office handled the Greitens case. 

Last month's indictment of Tisaby on charges of perjury and evidence tampering followed a monthslong investigation led by Gerard "Jerry" Carmody into allegations that Tisaby had lied during a March 2018 deposition in the lead-up to Greitens’ criminal trial.

Tisaby's lawyer has denied the allegations in the indictment, which included a series of pointed claims against Gardner: that she failed to correct Tisaby’s lies, failed to report them to police, and made incorrect statements to defense lawyers and a judge.

The Tisaby case stems from last year’s invasion-of-privacy case against Greitens, which Gardner dismissed during jury selection when faced with possibly having to testify about the investigation.

A spokeswoman for Gardner did not have a response Tuesday.

The target of the ongoing probe isn't clear.  At the end of April — well into the special grand jury's term — a judge's order allowed police to execute a search warrant for thousands of emails on the email server for the Circuit Attorney's Office.

A new grand jury likely would renew fiery legal fights over evidence that have played out in court for months between Carmody's firm and Gardner's office.

A St. Louis judge and special prosecutor have accused Gardner’s office of impeding the investigation by refusing to comply with a search warrant. Gardner’s lawyers have fired back with an aggressive legal strategy resembling that of Greitens’ team last year by trying to block the special prosecutor's requests for records, suing Carmody alleging Sunshine Law violations and claiming nepotism laws invalidate his appointment.

The special grand jury's probe was set to expire in May but a judge approved an extension for 60 more days.

Its conclusion also lifts a judge's gag order in the case.

Gardner's supporters have criticized the gag order and called for it to be rescinded. The NAACP and St. Louis' black clergy have labeled the grand jury investigation a politically-motivated, racist and sexist witch hunt aimed at destroying the city’s first elected black circuit attorney. They have also called for the removal of City Counselor Julian Bush, who asked for a special prosecutor on behalf of St. Louis police.

Joel Currier is a reporter for the St. Louis Post-Dispatch. Follow him on Twitter here: @joelcurrier.