, ▁played ▁by ▁Raymond ▁J . ▁Barry , ▁stating ▁that ▁he ▁used ▁to ▁work ▁for ▁him ▁in ▁Hen ne pin ▁County , ▁whose ▁seat ▁is ▁Min ne apolis . ▁ ▁He ▁became ▁the ▁night ▁shift ▁team ▁super visor ▁for ▁the ▁Las ▁Veg as ▁C SI ▁unit ▁on ▁the ▁second ▁episode ▁of ▁the ▁series , ▁after ▁Jim ▁Br ass ▁was ▁dem oted ▁following ▁the ▁death ▁of ▁co - worker ▁Hol ly ▁G rib bs . ▁In ▁season ▁seven , ▁Gr iss om ▁took ▁a ▁s abb at ical ▁to ▁teach ▁a ▁class ▁at ▁Williams ▁College ▁in ▁William st own , ▁Massachusetts , ▁for ▁four ▁weeks . ▁Prior ▁to ▁his ▁s abb at ical , ▁Gr iss om ▁had ▁been ▁showing ▁signs ▁of ▁" burn out ." ▁Upon ▁his ▁return , ▁however , ▁he ▁appeared ▁re inv ig or ated ▁and ▁told ▁W arr ick ▁Brown ▁that ▁he ▁" miss ed " ▁Las ▁Veg as . ▁After ▁the ▁res ignation ▁of ▁S ara ▁Sid le , ▁his ▁f ian c ée , ▁from ▁the ▁lab , ▁and ▁the ▁murder ▁of ▁W arr ick ▁Brown , ▁his ▁burn out ▁seemed ▁to ▁be ▁res ur f acing . ▁This ▁is ▁particularly ▁evident ▁in ▁" S ay ▁Uncle ," ▁where , ▁at ▁the ▁end ▁of ▁the ▁episode , ▁he ▁expressed ▁deep ▁regret ▁over ▁solving ▁a ▁particularly ▁de press ing ▁case . ▁ ▁Gr iss om ▁announced ▁his ▁ret irement ▁just ▁as ▁evidence ▁comes ▁to ▁light ▁that ▁the ▁Dick ▁and ▁Jane ▁K iller , ▁a ▁serial ▁k iller ▁from