The episode plunged straight into the action, with Detective Riley on the trail of Ray Biller. What began as a routine inquiry quickly escalated when Riley confronted Biller outside a bar. In a sudden and brutal turn, Biller shot Riley twice in the chest before fleeing the scene. Detective Theo Walker (David Ajala), arriving moments later, found his partner bleeding profusely. "Vince, stay with me, come on!" Walker pleaded, desperately trying to save him.

Despite Walker's efforts and the swift arrival of medical personnel, Riley succumbed to his injuries at the hospital, leaving his colleagues, including Lieutenant Jessica Brady (Maura Tierney), in profound shock and grief. His death not only marked a personal loss for the squad but also kicked off a high-stakes investigation to bring his killer to justice.

To aid in the investigation, Detective Robert Calvino, played by James Badge Dale, was introduced. The inquiry quickly uncovered a hidden layer to Riley's life. His wife revealed he had been withdrawing large sums of cash, the purpose of which was unknown to her. Following this lead, Brady and Calvino discovered Riley had been making regular payments to a pregnant woman. She confessed that Riley was giving her money out of guilt, as he had been responsible for her husband's death years prior.

The motive for Riley's murder soon became clear: revenge. Ray Biller was seeking retribution for his brother, Wayne, who had died in prison after Riley had previously arrested him for murder. The police located and arrested Ray Biller at his brother's funeral, identifying him as the prime suspect in Riley’s death.

The subsequent trial presented its own set of challenges for the prosecution. With no weapon recovered, the defense argued they couldn't definitively prove Biller was the shooter. District Attorney Nicholas Baxter (Tony Goldwyn) was determined to secure a conviction, even pushing for Detective Walker to testify. However, Executive Assistant District Attorney Nolan Price (Hugh Dancy) harbored doubts, questioning whether Walker had a clear enough view to identify Biller as the assailant. The emotional weight of the case was further highlighted by the appearance of Riley's troubled brother, Matt Riley (Ryan Eggold), who demanded justice for Vincent.

Despite the complexities and Price’s lingering skepticism about the testimony, the jury ultimately found Ray Biller guilty of first-degree murder. While a victory for the prosecution, the episode concluded with a sense of unease, as Price remained visibly conflicted about the integrity of the verdict. The dramatic exit of Detective Riley was reportedly due to actor Reid Scott's decision to leave the show, citing the demanding cross-country commute to New York City, where Law & Order is filmed.