▁of ▁his ▁first ▁cases . ▁ ▁A aron ▁Hot ch ner ▁( Th omas ▁Gib son ), ▁Form er ▁B AU ▁unit ▁chief ▁and ▁senior ▁super vis ory ▁special ▁agent ▁( se asons ▁ 1 – 1 2 ) ▁ ▁Hot ch ▁is ▁a ▁former ▁pro sec utor ▁and ▁was ▁originally ▁assigned ▁to ▁the ▁F BI ▁field ▁office ▁in ▁Seattle . ▁He ▁is ▁one ▁of ▁the ▁most ▁experienced ▁agents ▁in ▁the ▁B AU . ▁He ▁strugg les ▁to ▁balance ▁the ▁dem ands ▁of ▁his ▁job ▁with ▁his ▁family ▁life , ▁but ▁his ▁wife , ▁H ale y ▁Bro oks ▁( M ered ith ▁Mon roe ), ▁divor ces ▁him ▁in ▁season ▁ 3 . ▁In ▁the ▁episode ▁" 1 0 0 " ▁( season ▁ 5 ), ▁H ale y ▁is ▁killed ▁by ▁fug itive ▁serial ▁k iller ▁George ▁F oy et ▁( C . ▁Thomas ▁How ell ), ▁also ▁known ▁as ▁" The ▁Boston ▁Re aper ", ▁whom ▁A aron ▁f ights ▁and ▁be ats ▁to ▁death . ▁He ▁also ▁has ▁a ▁son ▁named ▁Jack ▁( C ade ▁O w ens ) ▁and ▁a ▁brother ▁named ▁Se an . ▁After ▁H ale y ▁is ▁murder ed , ▁he ▁has ▁cust ody ▁of ▁Jack , ▁and ▁H ale y ' s ▁sister , ▁Jess ica ▁Bro oks ▁( M olly ▁Baker ), ▁helps ▁him ▁take ▁care ▁of ▁Jack . ▁When ▁SS A ▁Jenn ifer ▁J are au ▁leaves ▁the ▁B AU , ▁A aron ▁and ▁technical ▁anal yst ▁Pen el ope ▁Gar cia