Interestingly, Dean also came across someone he hadn't met but who harbored resentment towards him: Lafferson. Lafferson was the deputy chief of the Detective Bureau, already old and about to retire.
Back when Dean was promoted to Detective Chief, according to normal procedure, someone from the Detective Bureau should have come forward to present him with a medal as encouragement, which also served as part of the induction process. But that old man Lafferson, harboring racial prejudices and about to retire, didn't even show Monet any courtesy. In the end, Dean, the youngest Detective Chief in the bureau, had a very low-key and unimpressive induction.
A gentleman's revenge can wait ten years, but it's never too late. Dean was no gentleman. He had never forgotten how that old man Lafferson had targeted him; he just hadn't found the opportunity to cause him trouble. Now, the opportunity had arrived!