on ▁was ▁killed ▁off ▁by ▁produ cers ▁off - screen ; ▁executive ▁producer ▁and ▁show runner ▁Er ica ▁Mess er ▁said ▁this ▁decision ▁was ▁made ▁as ▁it ▁was ▁clear ▁that ▁Pat ink in ▁would ▁not ▁return ▁to ▁the ▁series , ▁but ▁he ▁could ▁be ▁featured ▁in ▁a ▁flash back ▁if ▁he ▁were ▁ever ▁to ▁return ▁in ▁the ▁future . ▁▁ ▁Cook ▁and ▁H ew itt ▁were ▁on ▁hi atus ▁from ▁the ▁show ▁due ▁to ▁their ▁pre gn an cies ▁after ▁production ▁concluded ▁for ▁season ▁ 1 0 ; ▁A ish a ▁Ty ler , ▁who ▁plays ▁Dr . ▁T ara ▁Lewis , ▁joined ▁the ▁show ▁at ▁the ▁start ▁of ▁season ▁ 1 1 ▁in ▁a ▁rec urr ing ▁role , ▁though ▁she ▁appeared ▁in ▁most ▁episodes . ▁Cook ▁returned ▁after ▁seven ▁episodes ▁of ▁season ▁ 1 1 , ▁ ▁but ▁H ew itt ▁did ▁not ▁return ▁to ▁the ▁show ▁again . ▁Moore ▁depart ed ▁later ▁that ▁same ▁season ; ▁he ▁had ▁considered ▁leaving ▁in ▁season ▁ 1 0 ▁when ▁his ▁previous ▁contract ▁ended , ▁but ▁was ▁persu aded ▁to ▁stay ▁to ▁give ▁his ▁character ▁a ▁proper ▁send off . ▁Mess er ▁said ▁it ▁was ▁initially ▁planned ▁for ▁Moore ▁to ▁do ▁six ▁episodes , ▁but ▁it ▁was ▁decided ▁to ▁extend ▁this ▁to ▁the ▁first ▁ 1 8 ▁episodes ▁of ▁season ▁ 1 1 ▁as ▁six ▁episodes ▁" did n ' t ▁feel ▁like ▁enough ". ▁▁ ▁A ▁week ▁after ▁Moore ▁left , ▁P aget ▁B rew ster ▁made ▁her ▁second ▁special ▁guest ▁appearance ;