CHICAGO - Cook County, Ill., Board President Todd H. Stroger named his chief of staff, Joseph Fratto, to serve as interim chief financial officer after the surprise resignation of Donna Dunnings from the post Friday over her ties to a fired county employee.

Stroger announced Dunnings' resignation in an early Friday morning news release. He requested it after "Dunnings disclosure of issues related to a personal matter that could conflict with her ability to fulfill her responsibilities as chief financial officer."

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