▁take ▁over ▁her ▁job ▁as ▁communic ations ▁l ia ison . ▁A aron ▁dated ▁a ▁woman ▁named ▁Beth ▁C lem m ons ▁( B ell amy ▁Young ), ▁who ▁first ▁appeared ▁in ▁the ▁episode ▁" The ▁Bit ters weet ▁Science " ▁( season ▁ 7 ), ▁before ▁the ▁couple ▁separated ▁after ▁C lem m ons ▁accepted ▁a ▁job ▁in ▁Hong ▁Kong . ▁Following ▁an ▁on - set ▁alter cation , ▁Thomas ▁Gib son ▁was ▁removed ▁from ▁the ▁main ▁cast ▁after ▁season ▁ 1 2 , ▁episode ▁ 2 , ▁at ▁which ▁point ▁Hot ch ▁went ▁on ▁temporary ▁assignment . ▁In ▁a ▁later ▁episode , ▁it ' s ▁revealed ▁A aron ▁and ▁Jack ▁went ▁into ▁witness ▁protection ▁after ▁Jack ▁was ▁being ▁st alk ed ▁by ▁Peter ▁" Mr . ▁Sc r atch " ▁Lewis , ▁a ▁serial ▁k iller ▁from ▁a ▁previous ▁B AU ▁case . ▁Following ▁Lewis ' s ▁death ▁in ▁the ▁ 1 3 th ▁season ▁premi ere , ▁Pr ent iss ▁reve als ▁that ▁A aron ▁has ▁opt ed ▁not ▁to ▁return ▁to ▁the ▁B AU , ▁but ▁instead ▁to ▁ret ire ▁to ▁be ▁a ▁full - time ▁parent ▁to ▁Jack . ▁ ▁Elle ▁Green away ▁( L ola ▁Gla ud ini ), ▁Super vis ory ▁Special ▁Agent ▁( se asons ▁ 1 – 2 ) ▁Green away ▁is ▁assigned ▁to ▁the ▁F BI ▁field ▁office ▁in ▁Seattle ▁and ▁assigned ▁to ▁the ▁B AU ▁as ▁an ▁expert ▁in ▁sexual ▁off ense ▁cr imes . ▁Elle ▁suff ers ▁extreme ▁emot ional ▁tra