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The squad prepares a farewell party for the newly promoted Martinez (Nicholas Turturro, here making his last NYPD Blue appearance). Sipowicz (Dennis Franz) and Sorenson (Rick Schroder) trace a gun used in an earlier shooting to a more recent homicide, leading them to a deadly case of sibling rivalry. After a night of drinking, Denby (Scott Cohen) tells Diane (Kim Delaney) that he inadvertently let suspected drug trafficker Don Kirkendall (Erich Anderson) slip through his fingers. Later, Don contacts his ex-wife, Detective Jill Kirkendall (Andrea Thompson) -- who, after the conversation, seems uncharacteristically willing to place loyalty over duty.