

Hank eventually figured out they were dating but never told Halstead and Lindsay that he knew. Halstead recommends coming forward and just telling Voight but Lindsay refuses and their relationship ends. The two end up dating for a few episodes but when Lindsay returns to her job at Intelligence the two are very cautious about being caught. to join a new task force, she and Halstead begin a romantic relationship because they are not working together anymore but keep it on the down-low because they are both worried what Voight's reaction to the two of them dating will be.

When Lindsay accepts an offer from the D.E.A. The resulting argument ended in Lonnie being strangled with a belt. It is later revealed that Lonnie's father, Phil had discovered child pornography on Lonnie's computer and confronted him. Voight pulls Halstead's badge and has Dawson keep an eye on him. Halstead strongly hated Lonnie and his father so when Lonnie Rodiger is found dead, Halstead is a suspect. Lonnie Rodiger had killed a young boy who Halstead was very close with, since it was his ex-girlfriends younger brother. It is also determined that Lindsay prefers to keep their relationship purely business because her boss Hank Voight (fatherly figure to Lindsay) doesn't tolerate relationships in the Intelligence Unit. When Lindsay realizes she's out of place, the two instead go to dinner. Halstead accompanies Lindsay to her high school reunion.

His interrogation tactics are blunt and tough. A skilled marksman and a former Ranger, he provides the tactical know-how and is often the designated sniper covering for the team when needed. Halstead had been in the Intelligence Unit for a month when the show premieres. He has been awarded an Army Expert Marksman Medal. episode " They'll Have to Go Through Me".Before joining the CPD, brash young police detective Jay Halstead was a specialist with the 3rd Battalion, 75th Ranger Regiment, the same regiment as FBI Special Agent Omar Adom "OA" Zidan, and served two tours in Afganistan with former CPD intelligence unit tech expert Craig "Mouse" Gurwitch.

Markie Post as Barbara "Bunny" Fletcher.Mariska Hargitay as Sergeant Olivia Benson.Kelli Giddish as Detective Amanda Rollins.Elias Koteas as Detective Alvin Olinsky.Amy Morton as Desk Sergeant Trudy Platt.LaRoyce Hawkins as Officer Kevin Atwater.Marina Squerciati as Officer Kim Burgess.Patrick John Flueger as Officer Adam Ruzek.Jesse Lee Soffer as Detective Jay Halstead.Platt shows her deep respect for police and the dangerous work they do by honoring their fallen brother. Meanwhile Burgess and Roman try to find the shooter from the hospital after using surveillance footage to identify him. Amaro along with Halstead and Antonio continue to hunt for the link to foster care and child trafficking. The final part of the crossover event finds our intelligence unit joined by detectives from New York's special victims unit to help solve the pedophile ring case.
