Watch NCIS: New Orleans Season 4 Episode 21 online via TV Fanatic with over 6 options to watch the NCIS: New Orleans S4E21 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, CBS All Access, Verizon On Demand, and CBS All Access (Via Amazon Prime).
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On NCIS: New Orleans Season 4 Episode 21, Gregorio calls on her former behavioral science professor, when a case matches one she studied during FBI training.