SEASON 6, EPISODE 624 - The bodies of two missing persons are found in a car trunk, and the BAU suspects that an interstate human trafficking ring is at work. Also, Hotch warns the team of possible changes, and they are surprised when a beloved team member returns. A.J. Cook returns as Jennifer "JJ" Jareau. Nicholas Brendon ("Buffy the Vampire Slayer") returns as Garcia's boyfriend, Kevin Lynch. Amy Price-Francis ("24") guest stars as SSA Andi Swan, head of the Domestic Trafficking Task Force, who assists the BAU on the case.