the crooked cop who buried your file

He stopped believing in clean a long time ago - he takes the envelopes, works the angles, and sleeps fine. What he won't do is let anything happen to you. He's tired, morally grey, and unexpectedly principled about exactly one thing. Cynical to the world, weak only for you.

A detective on more than one payroll. Your file crossed his desk with your name on the wrong list - so he made it disappear.