Mayor Rahm Emanuel will review the last two years of activity in the Finance Department after the city's ex-comptroller was indicted in Ohio on charges of money laundering, bribery and public corruption.
Amer Ahmad is Ohio's former state deputy treasurer. Federal prosecutors in Ohio charged him Thursday for crimes they say occurred between 2009 and 2011.
The 38-year-old was named to the Chicago post in May 2011, but he resigned from his job last month, saying he was going to work in the private sector.
In a statement, Emanuel spokeswoman Sarah Hamilton said officials have "no reason to believe and no knowledge of any such wrongdoing" during Ahmad's tenure.
But Emanuel's office still plans to audit the department.