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The mayor of Tennessee's largest city, under fire for admitting to a scandalous two-year affair with her bodyguard, is expected to announce her resignation at a press conference Tuesday, local media reported.

Sgt. Forrest's daughter, a recent graduate of Belmont Law School, was hired in Metro Nashville's Legal Department after a strong recommendation from Mayor Barry for a job that was created specifically for her and for which no other candidates were interviewed.

Barry is the subject of three investigations, including a criminal inquiry by the Tennessee Bureau of Investigation at the urging of District Attorney Glenn Funk. That spending was likely related to travel and overtime costs incurred by Forrest as he guarded Barry on the road. Part of her deal included the stipulation that she would resign from public office as Mayor today.

On Tuesday, she pleaded guilty to theft of property over $10,000; Barry agreed to reimburse the city $11,000 and serve three years' probation, according to the newspaper.

Also on Tuesday, the former head of Barry's security detail, Rob Forrest, pleaded guilty to theft of property over $10,0000. Barry said the affair began in spring 2016, according to an affidavit.

In January, Forest and Barry said they were no longer seeing each other.

On Tuesday, she would be the first Nashville mayor to leave office before the expiration of their term in almost a century.

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Barry's exit comes after she admitted January 31 to a almost two-year affair with Forrest, who retired that same day.

Investigators found nude photos of Barry on Forrest's phone that were taken while he was accompanying the mayor on supposed city business.

February 4: Mayor Megan Barry wants to earn Nashville's forgiveness. She would not say when the affair ended, only saying that it's over. The two photos were taken a day apart, the affidavit states.

Forrest was the only city employee on at least 10 taxpayer-funded trips with the mayor from the middle of 2016 through 2017 - a period in which the couple were having an affair. Forrest broke the news to Barry, The Tennessean reports. Forrest, who had spent more than 31 years with Metro Nashville Police and supervised the mayor's security detail over three administrations, has retired.

Barry's resignation would have triggered a stand-alone special election if the next city general election was more than one year away.

Barry has been considered a rising political star, and the disclosure comes at a fraught time for her.