A former top official in the Detroit mayor's office says he resigned because he had concerns about how contracts were being awarded under state-appointed emergency manager Kevyn Orr (pictured).

The Detroit Free Press on Friday reported details from the resignation letter of Andre DuPerry, who served as the city's chief procurement officer. DuPerry's last day was Oct. 11. He was recruited by Mayor Dave Bing in 2009 to help improve Detroit's finances.

In the Sept. 27 letter to Bing, DuPerry said it was "impossible for me to feel confident that there is currently transparency, fairness and good judgment."

Emergency manager Kevyn Orr's spokesman Bill Nowling says DuPerry was "a disgruntled employee who chose to move on." Nowling says DuPerry didn't make allegations cited in the letter while employed by Detroit.