Amanda MacDonald

The team investigates a serial killer who is targeting women at a small college in Flagstaff, Arizona. The BAU shuts down the campus, creates a detailed profile of the unsub, and arrests a suspect. However, the team members begin to have doubts about themselves when another woman is killed while the suspect is in custody.

Derek and Meredith try (unsuccessfully) to be discreet as they spend the night together at Meredith's house, but their haggard appearance speaks volumes to everyone - including Bailey, who warns Meredith to end the relationship. Meanwhile George suspects an anesthesiologist of drinking on the job but is reluctant to speak up about it, Alex treats a former schoolmate who finds honor in self-mutilation, Izzie's boyfriend takes extreme measures in order for them to spend more time together, and Cristina seems to be battling a case of the flu.

Jane gets the CBI involved in a case in Napa in order to focus on Sheriff McAllister, while Van Pelt and Rigsby finally take a trip down the aisle and get married.

Gibbs and the team work to clear the name of a Navy medic killed in Iraq, who is the prime suspect in a murder in his hometown.

When Jim learns of Trey's St. Patrick's Day fundraiser plans, he offers his expertise in an effort to save Trey and the Celtics from embarrassment.