Law & Order: Criminal Intent: Season 2, Episode 20

2 - 20: Blink

Goren and Eames investigate the murder of a math student who had worked in a poker club as a card-counter. They uncover a group of computer nerds, then discover a computer gambling system with tougher suspects. The detectives learn even their own workstations are hit by the ringleader of the group (Ian Kahn).