es ▁his ▁off - days ▁when ▁crack ing ▁a ▁cold ▁case ▁or ▁an ▁ur gent ▁case ▁( ep is ode ▁ 3 . 1 6 ▁" He art ▁of ▁G lass "). ▁F lack ▁commented ▁in ▁episode ▁ 5 . 2 3 ▁" Gre ater ▁Good " ▁that ▁Mac ▁" must ' ve ▁been ▁the ▁kid ▁who ▁did ▁all ▁the ▁extra ▁credit ▁questions ▁and ▁made ▁us ▁all ▁look ▁bad " ▁after ▁seeing ▁him ▁at ▁work ▁on ▁an ▁off ▁day . ▁In ▁episode ▁ 1 . 0 1 ▁" B link " ▁St ella ▁expressed ▁her ▁concern ▁about ▁Mac ▁after ▁finding ▁out ▁that ▁he ▁ski pped ▁his ▁off ▁hours ▁and ▁div ed ▁right ▁into ▁the ▁new ▁murder ▁case . ▁ ▁When ▁Miami ▁C SI ▁Lieutenant ▁Hor atio ▁Ca ine ▁comes ▁to ▁New ▁York ▁in ▁purs uit ▁of ▁a ▁murder ▁suspect , ▁Mac ▁and ▁his ▁team ▁help ▁him ▁discover ▁the ▁real ▁k iller ▁and ▁app reh end ▁him ▁( C SI : ▁Miami ▁episode ▁ 2 . 2 3 ▁" MI A / N Y C ▁Non stop "). ▁Mac ▁later ▁f lies ▁down ▁to ▁Miami ▁to ▁assist ▁Ca ine ▁in ▁re capt uring ▁escaped ▁murder er ▁Henry ▁D arius , ▁who ▁eventually ▁heads ▁back ▁to ▁New ▁York . ▁He ▁meets ▁Hor atio ' s ▁C SI ▁Ass istant ▁Cal le igh ▁Du ques ne . ▁T ogether , ▁the ▁C SI ▁detect ives ▁( Hor atio ▁and ▁Mac ) ▁successfully ▁app reh end ▁D arius ▁and ▁extr ad ite ▁him ▁to ▁Florida ▁( C