Foxx had recused herself from the case a week before charges were filed because of familiarity with a potential witness, a spokeswoman for her office said.
Chicago officials said they were planning to send actor Jussie Smollett a bill for the cost of the investigation into claims that he was a victim of a "hate crime". The case was handed to First Assistant State's Attorney Joseph Magats.
Meanwhile, Smollett's lawyer, Tina Glandian, said she is "not at all" concerned about an investigation of Smollett by the Department of Justice and FBI in an appearance on NBC's Today show Thursday.
IL prosecutor Joe Magats said the charges were dropped because Jussie forfeited a $10,000 (£7,600) bond payment and carried out community service.
Smollett told police that he had been attacked by two white men shouting racist and homophobic slurs, and that a chemical he thought was bleach was poured on him.
On Tuesday, the state's attorney's office, with little explanation, dismissed the charges against him, sparking widespread confusion and anger. "The Osundairo brothers, what are the chances that's the case?"
The 36-year-old actor, best known for his role on the Twentieth Century Fox Television hip-hop drama "Empire", was charged in February with staging the incident himself and filing a false police report. But the two men were then abruptly released and not charged with a crime. By this point, having the Federal Bureau of Investigation go out and investigate the supposed hate crime attack itself and Smollett's subsequent statements to authorities is probably pointless.
Prosecutors offered little explanation and infuriated Chicago's police chief and mayor this week when they dropped 16 felony counts against Smollett related to making a falsepolice report, yet they still insist the actor faked a racist, anti-gay attack on himself in January. But those charges were suddenly droppedafter the actor forfeited his bail money and did community service. He has said the $5,145 paid to the brothers was for fitness training. In January, the president called the alleged attack "horrible" and noted that it "doesn't get any worse". "He walks out, says 'I'm innocent.' They say, 'No, he's guilty, and the police work is good, '" Emanuel added. The move made it possible for Smollett's attorneys to get his criminal case immediately sealed and wiped clean.
In an interview with AP earlier this month, she said the brothers regretted their involvement.
"They were thinking, 'I'm going to help my friend". She said it was not the responsibility of the defense team to let them know. A phone number associated with their home had a voicemail box that was full.
The actor said this has been "an incredibly hard time".
"The Osundairo brothers said a few times that the $5,145 cheque they received was for exactly what Jussie said".
Trump’s Aides Take a Victory Lap After Mueller Summary Dud
Leading House Democrats, backed by Speaker Nancy Pelosi, are unveiling broad legislation to shore up the Affordable Care Act . They had mixed opinions on whether it should be redacted if the Trump administration decides it is necessary.