Plot summary
The detectives investigate the murder of Wharton Carlyle ( Jeff Hayenga ), found stabbed to death in a yacht marina. They interview the victim's teenaged daughter, Lilly Carlyle ( Aleksa Palladino ), a frequent nightclub goer with drug and alcohol addiction. During the investigation, Goren and Eames' suspicions turn to the nightclub owner John Hampton ( Adam Trese ) who has close connections with organized crime. When the detectives look deeper into the case, they discover their main suspect, Hampton, is an undercover FBI agent posing as a thug to infiltrate a drugs ring. The detectives and the FBI clash over the conflict of interests but the DA's office eventually get their man.
Credits
Adapted from Wikipedia contributors, Law & Order: Criminal Intent season 1. HTML formatting and reference markers removed.