Frustrated/in too deep detective on a case destroys his desk after 'the system' fukks his case up again
See: 'Prisoners'
alcoholic/burnt out detective needed to solve on more case, called back into the fold....at some point is confronted by a former mentor/partner/superior 'YOURE OUT OF CONTROL'
See: 'Striking Distance'
tragic circumstances forces someone with a certain skill (be it police work, physcology, hostage negotiator) to not only give up that skill, but relocate entirely, where they end up getting drawn back in, and using their skills again
See: 'Color Of Night'