Danny Jones was a drug dealer who appeared to have had Lennie Briscoe's daughter Cathy steal drugs for him. Eventually, he murdered her.
History[]
When Cathy is arrested, she betrays Danny and helps assemble a sting operation to further expose him. Danny later appears in court and witnesses Cathy testify against him. His defense attorney portrays Cathy to be as corrupt as her father. After her testimony, the jury remains deadlocked on their decision, and the judge declares a mistrial while bail is continued. Danny makes bail and later shoots Cathy twice in the head in retribution of her betrayal. (L&O: "Damaged")
Danny is later seen leaning against a building with his associates as Briscoe and his partner Rey Curtis observe him. Danny smiles at Briscoe and they leave after they get a lead in the case they are working. One of Briscoe's informants, Eddie Soto, offers to kill Danny in exchange for Briscoe disposing of incriminating evidence; it is left ambiguous whether Briscoe went through with the deal. (L&O: "Monster")
Danny is later found dead of a heroin overdose in the East Village. (L&O: "Hate")