asons ▁ 1 2 – 1 5 ; ▁rec urr ing ▁season ▁ 1 1 ) ▁ ▁Lewis ▁is ▁a ▁psych ologist ▁with ▁an ▁eye ▁on ▁for ens ic ▁psych ology ▁and ▁its ▁application ▁toward ▁the ▁criminal - just ice ▁system . ▁Her ▁dream ▁was ▁to ▁study ▁psych op ath s ▁up ▁close ▁and ▁personal — and ▁her ▁psych ology ▁background , ▁combined ▁with ▁her ▁experience ▁in ▁the ▁F BI , ▁brought ▁her ▁face ▁to ▁face ▁with ▁mon sters . ▁Her ▁job ▁was ▁to ▁st are ▁them ▁down ▁and ▁interview ▁them , ▁to ▁determine ▁if ▁they ▁were ▁fit ▁to ▁stand ▁trial . ▁Lewis ▁replaced ▁both ▁J J ▁( A . J . ▁Cook ) ▁and ▁Kate ▁( J enn ifer ▁Love ▁H ew itt ) ▁while ▁they ▁were ▁on ▁mat ern ity ▁leave ▁in ▁the ▁ 1 1 th ▁season . ▁ ▁Luke ▁Al vez ▁( Ad am ▁Rod rig uez ), ▁fug itive ▁task ▁force ▁agent ▁and ▁super vis ory ▁special ▁agent ▁( se asons ▁ 1 2 – 1 5 ) ▁ ▁Al vez ▁is ▁a ▁member ▁of ▁the ▁F BI ▁fug itive ▁task ▁force ▁that ▁partners ▁with ▁the ▁B AU ▁to ▁catch ▁the ▁serial ▁kill ers ▁that ▁escaped ▁in ▁the ▁season ▁ 1 1 ▁finale . ▁In ▁the ▁season ▁ 1 2 ▁premi ere , ▁he ▁works ▁with ▁the ▁B AU ▁to ▁catch ▁the ▁" C rim son ▁King ", ▁one ▁of ▁the ▁escape es ▁that ▁attacked ▁Al vez ' s ▁old ▁partner . ▁The ▁team ▁disco vers ▁the ▁real