▁the ▁puzz le ▁pieces ▁and ▁the ▁T - sh irt ▁and ▁sees ▁that ▁wh ome ver ▁handled ▁the ▁puzz le ▁was ▁the ▁brother ▁of ▁the ▁T - sh irt ' s ▁owner . ▁Mac ▁f lies ▁to ▁Chicago ▁and ▁the ▁building ▁from ▁the ▁puzz le . ▁The ▁episode ▁ends ▁with ▁the ▁ 3 3 3 ▁caller ▁saying ▁to ▁him ▁" How ▁does ▁it ▁feel ▁to ▁be ▁home , ▁Det ect ive ▁Taylor ?" ▁ ▁In ▁ 4 . 1 0 ▁" The ▁Th ing ▁About ▁Hero es ... ", ▁Mac ▁continues ▁his ▁Chicago ▁investigation ▁and ▁follows ▁the ▁cl ues ▁to ▁a ▁body ▁h anging ▁in ▁an ▁un used ▁floor ▁of ▁the ▁Chicago ▁Trib une ▁building . ▁A ▁hang man ▁puzz le ▁written ▁on ▁the ▁wall ▁leaves ▁out ▁the ▁letters ▁that ▁spell ▁" C ow ard ". ▁The ▁decom posed ▁body ▁is ▁revealed ▁to ▁be ▁that ▁of ▁Bobby ▁To ole ▁who ▁died ▁thirty ▁years ▁ago . ▁Mac ▁goes ▁and ▁tal ks ▁to ▁a ▁former ▁friend ▁of ▁his ▁named ▁Jimmy . ▁He ▁asks ▁Jimmy ▁if ▁he ' s ▁the ▁st alk er ▁and ▁if ▁it ' s ▁because ▁of ▁his ▁brother ▁Will ' s ▁death . ▁Mac ▁has ▁proof ▁the ▁blo ody ▁T - sh irt ▁is ▁Will ' s ▁and ▁says ▁they ▁were ▁the ▁only ▁ones ▁who ▁knew ▁that ▁Bobby ▁To ole ▁killed ▁Will ▁and ▁that ▁they ▁killed ▁Bobby . ▁Jimmy ▁is ▁inc ensed ▁at ▁the ▁idea ▁and ▁that ▁Mac ▁is ▁acting ▁high ▁and ▁mighty ▁after ▁he ▁apparently ▁let ▁Will ▁down ▁that ▁night .