This is a list of fictional characters in the television series Chicago P. The article deals with the series' main, recurring, and minor characters. Detective Jay Halstead previously appeared on Chicago Fire as Alvin olinsky wife sexual dysfunction undercover cop assigned to take down a local mobster-cum-thug. He "Alvin olinsky wife sexual dysfunction" a transfer to the Intelligence Unit after the assignment ended with him getting shot but successfully arresting the mobster.
Aside from the undercover assignment that served as a premise for his transfer to Intelligence, little is known Alvin olinsky wife sexual dysfunction his early CPD career, except that he was already friends with Antonio Dawson prior to the transfer and that he had joined after serving in the military. Halstead is the older  brother of Will, an attending at the fictional Chicago Medical Center and a main character in Chicago Med.
Their mother had died of cancer  and they had a very difficult relationship with their father Pat,   who had initially disapproved of his sons not following the expected practice to immediately find work locally after high school; instead, both his sons left Chicago to find their own career paths, Will for medical school and Jay for the military. Their mother's death was a sore point as Jay still harbors some lingering resentment over the fact that Will was not around during that time and "out partying" presumably to get over his ex-girlfriend.
Otherwise, the brothers share a close relationship and look out for one another. The Halsteads are from a working class  Irish Catholic background, based on the fact that both brothers attended Catholic school   and Will's statements about being an altar boy and growing up in Canaryvillea historically Irish neighborhood in the South Side of Chicago.
During one of their tours in Afghanistan they were both deployed to the notoriously hostile Korangal Valley     and were in Alvin olinsky wife sexual dysfunction lead Humvee of a convoy which was attacked, resulting in Mouse being given a medical discharge. His military background and training Alvin olinsky wife sexual dysfunction apparent, despite having left the service for quite some time.
For example, his apartment is spartan and well-kept and he is very physically fit, highly proficient in close quarters combat  and able to maintain his concentration on a subject from behind a sniper rifle scope for long periods of time.
Halstead is known for his bluntness, especially when interrogating suspects. In season 1 he sometimes rubbed his superior Detective Sergeant Hank Voight the wrong way for questioning the latter's actions. Despite his calm and collected demeanor, he can be brash in making split-second decisions and has a temper. However, Voight retains him in the Intelligence Unit as he recognized Halstead's skill and dedication to the job. A highly skilled marksman Halstead is proficient with his standard issue Glock 17 and M4 firearms as well as a sniper rifle     and has an extensive knowledge of ballistics and explosives.
Halstead has the tendency to blur the line separating his private and personal life, especially when people close to him are involved. For example, he conducts his own surveillance of Lonnie Rodiger, a young pedophile whom he correctly suspected of murdering young boys, including the younger brother of his high school girlfriend Allie.
In the pilot episode, it is established that Halstead had been partnered with Erin Lindsay for the past month and they share a close relationship, which has evolved into a more intimate relationship at various times which they have had to keep secret but prevented from going any further due to Voight's dislike of "in-house romances".
She tries to set him up on dates with her friends in the first several episodes of season 1 but soon realizes that she has feelings for him. He was presumably the first person Lindsay confided her past to, in full detail. The two struck up a romantic relationship after Erin transfers to a federal task force, as they no longer had to worry about fraternization rules.
When Lindsay spiralled out of control in the weeks following Nadia's death, he tried to help her, even after Voight had given up. She returns in the season 3 premiere after his cover was blown during an undercover operation to nab a drug kingpin. She rescues him in the nick of time and "Alvin olinsky wife sexual dysfunction" to return to Intelligence, where she is again partnered with Halstead.
They reconnect and rekindle their relationship. In the episode "You Never Know Who's Who", they go public for the first time by openly kissing while hanging out at Molly's. In episode "Remember the Devil" it was revealed that Halstead was married to a woman named Abby, whom he had met while deployed in Afghanistan and married in a drunken one-night stand.
At the end of the episode "Fork in the Road", he was seen making a call to Lindsay to propose to her but it was seen that she didn't answer the call. It is later revealed that she was leaving for New York City after a series of incidents from the episode essentially led to her accepting a job there and escape further scrutiny from the CPD. In season 5 premiere "Reform", he is partnered with Hailey Upton and their partnership continues to be rocky.
He is Alvin olinsky wife sexual dysfunction subject in an investigation and scrutiny from public when a drug deal went wrong. When a young girl was shot during the ordeal and eventually died at Chicago Medlater on showed that the bullet came from his gun. In "Care Under Fire", it became known that he is still having nightmares about his tours in Afghanistan.
He went undercover Alvin olinsky wife sexual dysfunction infiltrate a kidnapping crew composed of military veterans and struck up a friendship with Luis Vega, his "target", due to their shared background as former Rangers who had been deployed to Afghanistan. When the target is killed, his flashbacks came up causing him to dangerously come close to shooting Upton.
During the episode, he gets into a relationship with Camila Vega, Luis's sister. He continues to pose as Ryan and does not reveal his true identity to her. In "Rabbit Hole", the relationship between Halstead and his new girlfriend Camila takes a dramatic turn when he unintentionally gets himself in the middle of a drug operation and a murder of an undercover DEA agent.
He later finds out that Camila is a person of interest. But later in the investigation, she confesses that she was recruiting people to become drug dealers. When Voight sees that Halstead was acting funny, he asks him if he was in a relationship with her, he lied and denied it. But when the sting in getting the murderer to confess falls apart, his colleagues rushes in the garage and as Alvin olinsky wife sexual dysfunction was getting arrested, she realizes that he was a Alvin olinsky wife sexual dysfunction. As she was sitting in a jail cell, Upton convinces Camila to not see Halstead again and to not speak of their relationship to anyone or face spending years in prison.
In the following episode "Confidential", he was placed on desk duty by Voight and was ordered to see a psychiatrist. He eventually returned to the field and admitted to Upton in the episode "Chasing Monsters" that he found therapy helpful and was finally addressing his PTSD.
Halstead first appeared on Chicago Fire as a recurring character before becoming a main character on Chicago PD. Special Victims Unit to assist with cross-jurisdiction cases. The character was introduced in season 2 as a regular customer at Molly's, a bar jointly run by paramedic Gabriela Dawson and her firefighter colleagues. He had fallen for Gabby but she breaks up with him upon finding out he was a "henchman" of Arthur, a local thug who had threatened to burn down Molly's.
Although her brother Antonio tells her that Halstead was actually a cop, Gabby decides to end their relationship, as she had felt betrayed even though she understood that Halstead could not blow his cover.