Federal prosecutors say the city's police department was the main focus of a 15-year bribery scheme that also involved the sheriff's office and the state police.

It’s been a year since the public learned of the massive corruption scandal involving a scheme to make DWI cases disappear. Federal documents last week, shed more light on the conspiracy involving police officers and attorneys that dates back more than two decades.

The retirement comes the same day as an interview was scheduled with the Internal Affairs Task Force, according to police.