Episode 517, "Solitary Man" Today 4|3c
SEASON 6, EPISODE 618 - Prentiss is ready to confront her nemesis, Ian Doyle, once and for all. Meanwhile, the BAU calls upon JJ to help them find Prentiss and capture Doyle before it's too late. Series star Matthew Gray Gubler directs the episode. A.J. Cook returns as Jennifer "JJ" Jareau.