Episode 414, "Checkmate" Thu, May 7, 9|8c AM
SEASON 6, EPISODE 612 - The team searches for a lost shipment of high-caliber firearms when one of the weapons is responsible for random killings throughout the city. Also, Charlie and Amita disagree on a wedding date while Don re-evaluates his relationship with Robin. Guest Stars Include James Remar ("Dexter," "Sex and the City") As Weapons Dealer Randall Priest, and Jon Seda ("Close to Home," "Homicide: Life on the Street") As Arms Broker Lonnie Moses. John Cariani ("Law & Order") Reprises His Role As Professor Otto "Otto-Bahn" Bahnoff.