A Kiss Before Frying - S11-E12
Continuity mistake: Near the end when Greg meets Rita at the bus station, she puts her arms around his neck. The next shot from the front shows her arms and hands on Greg's chest. Rita's arm/hand position changes continually throughout the scene.
Answer: The episode on CSI:NY was called "Love Runs Cold" and first aired on October 4, 2006 (Season 3, Episode 3) and involves the investigation of a model found stabbed to death by an ice dagger.
OneHappyHusky