905 "Misconceptions" even with their differences, they go together to scatter their late father's ashes in Yankee Stadium. Terrence Davis (played by Nelly in seasons 5–6) is a former gang member turned confidential informant for Flack. Flack has utilized Terrence's services many times until he signs off Terrence as his CI following the death of his girlfriend, Jessica Angell. Jess's death drives Flack down a path of drinking and when Flack gets into a drunken fight with some thugs on the subway, Terrence shows up and saves Flack's life. Terrence later turns him over to Mac to get him some help (6.08 "Cuckoo's Nest"). Christine Whitney (played by Megan Dodds in seasons 8–9) is an old friend and new girlfriend of Mac Taylor. Back when Mac was still in uniform his partner, Stan, was Christine's brother. Stan was killed on the job. Christine runs a small restaurant and spent a lot of time with Mac when he was recovering from being shot (818 "Near Death"). Mac finally tells her he loves her in episode 907 "CLUE: SI". Russ Josephson (played by David James Elliott in season 7) is Jo's ex-husband and an FBI Special Agent. Notable villains Sonny Sassone (played by Michael DeLuise in seasons 1–2) is the leader of a street gang called The Tanglewood Boys and is responsible for several murders. He comes across a Tanglewood poser named Paul Montenassi, beats him to death with a signed baseball bat, and sands off the fake Tanglewood tattoo so that Paul will not be tied to his gang. He is arrested by Mac and states that he will beat this murder rap (1.13 "Tanglewood"). He is not convicted. A year later he comes under investigation again after one of his accomplices confesses to where a body is buried. Danny's DNA is found on a cigarette near the body. Danny's brother, Louie, confronts Sonny about the murder while wearing a wire to exonerate his brother. Sonny beats Louie into a coma, unaware of the wire. The CSIs manage to finally nail Sonny for murder and attempted murder (2.20 "Run Silent, Run Deep"). D.J. Pratt (played by Chad Williams in season 2) is a painter who rapes women. Aiden is able to find DNA evidence against him for one victim, Regina Bowen, but at trial he is acquitted because Regina refuses to testify (2.01 "Summer in the City"). When he attacks her