CHICAGO - Detroit Public Schools chief financial officer William Aldridge has left after more than three years at the troubled district.

Aldridge left the position April 7, according to sources. Deputy CFO Delores Brown is serving as interim CFO.

DPS spokesman didn't comment.

Aldridge's departure comes at a critical stage for the district. Michigan Gov. Rick Snyder says a major reform of DPS is one of his top priorities this year. A coalition of Detroit business people and educators sent the governor a series of recommendations two weeks ago.

Snyder is expected to introduce legislation -- which may include the state taking off a chunk of the district's $2.1 billion of debt - this spring.

The district, which carries junk ratings, has been under state-controlled emergency management since 2009. Despite the years of oversight and several deficit bond borrowings, it faces a $170 million deficit in fiscal 2015.

Aldridge came to DPS in September 2011 from a Detroit-based consulting firm. His job marked a return: he previously served as the district's CFO from 1996 to 2000. Before that he was its chief accountant in charge of budget and finance operations. Prior to that, he was at the Cleveland school district.

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