The letter was eventually published by The Denver Post.
Division Chief Tracie Keesee was demoted to captain following an internal investigation.
The investigation discovered the letter was sent through her computer at one point, but found it was not written by her.
The letter criticized Chief Robert White of not doing enough to bring needed change to the department.
Several other officers were also reassigned.
Keesee was considered to be a favorite for the job as chief among the rank and file.
(KUSA-TV © 2012 Multimedia Holdings Corporation)