The 4 Assist. Chiefs were adults that knew the rules about Internal Affairs Investigations. Perhaps those are confidential? 
O'Dea is certainly not the first PPO to have been involved in a difficult situation off duty in another state or a different part of the state. 
The Internal Affairs Asst. Chief most certainly bears most of the blame on the silence unless it was considered confidential, don't you think?
Hales saying he "thought" the standard investigation was underway. 
So, no e-mails or phone calls to suggest how O'Dea or Hales or the City Attorney was advised of the situation?
City council members clueless citing no info given out on "personnel issues." 
Is that typical or atypical for the circumstances? 
Who broke the story to you in the first place?
Inquiring minds want to know?