▁Mac ▁also ▁is ▁shown ▁playing ▁bass ▁in ▁the ▁episode ▁ 4 . 0 4 ▁" Time ' s ▁Up ", ▁after ▁receiving ▁a ▁good bye ▁letter ▁from ▁P ey ton . ▁ ▁Rel ations hips ▁ ▁Rom antic ▁ ▁Tow ards ▁the ▁end ▁of ▁the ▁ 6 th ▁season ▁Mac ▁comm ences ▁a ▁relationship ▁with ▁ER ▁Doctor ▁and ▁Air ▁Force ▁Res erv ist ▁A ubre y ▁Hunter ▁played ▁by ▁M äd chen ▁Am ick , ▁who ▁when ▁visit ing ▁the ▁NY PD ▁crime ▁lab ▁was ▁im pressed ▁when ▁she ▁found ▁out ▁that ▁Mac ▁had ▁served ▁in ▁the ▁US ▁Marine ▁Corps . ▁However , ▁she ▁did ▁not ▁feature ▁in ▁the ▁ 7 th ▁season . ▁Mac ▁first ▁meets ▁A ubre y ▁in ▁his ▁local ▁D eli . ▁ ▁With ▁other ▁NY PD ▁staff ▁In ▁dealing ▁with ▁the ▁younger ▁members ▁of ▁his ▁team , ▁Mac ▁is ▁strict ▁and ▁does ▁not ▁hes itate ▁to ▁susp end ▁them ▁if ▁they ▁are ▁found ▁to ▁be ▁in ▁a ▁conflict ▁of ▁interest ▁or ▁becoming ▁too ▁em otion ally ▁attached ▁to ▁a ▁case , ▁such ▁as ▁when ▁A iden ▁Burn ▁was ▁purs uing ▁the ▁DJ ▁Pr att ▁ra pe ▁case ▁and ▁when ▁Haw kes ▁did ▁not ▁report ▁a ▁personal ▁conflict ▁of ▁interest ▁when ▁his ▁ex - g irl friend ▁was ▁a ▁subject ▁in ▁one ▁of ▁Mac ' s ▁investig ations . ▁ ▁Mac ▁had ▁a ▁close ▁friendship ▁with ▁fellow ▁detect ive ▁St ella ▁Bon as era ▁and ▁was ▁suit ably ▁concerned ▁when ▁she ▁was ▁held ▁host age ▁in ▁her ▁own ▁a