Kelly Severide

Severide graduated at the top of class at the academy and held the record for the youngest firefighter to make squad when he was 23 years old.[1] He and his long-time colleague and close friend Captain Matthew Casey of Truck 81 have known each other since their days at the fire academy but have a falling-out over the death of their friend and colleague Andy Darden, whom Severide has known since childhood, over a botched-up call, which is where the pilot picks up. They work things out by the end of the season.

The son of CFD Captain Benny Severide (Treat Williams), Kelly was raised singlehandedly by his mother, Jennifer Sheridan (Kim Delaney), after Benny left the family when Kelly was in elementary school. Although Kelly has since reconnected with his father, they still share a love-hate relationship. He is often known to the "white shirts" (high-ranking officers) as Benny's son[2][1] but never used his father's name to advance his career, instead carving out his own reputation as a highly competent firefighter.

His charismatic personality makes him a popular figure with both his colleagues and the ladies. He tends to be casual with his men and can be seen at the squad table or in the lounge chatting or playing cards with the rest of the firehouse. Despite this, he tends to keep his private problems to himself and lets it simmer, which often worries his chief. In contrast to Casey, he is highly adept at reading people, especially his own colleagues, and his observation skills have come to the fore in several arson investigations; in season 2, he correctly predicted that Hadley had been targeting the men of 51 and that Candidate Rebecca Jones, who committed suicide just months after graduating from the academy, lacked the discretion and inhibitions to truly excel as a firefighter (although she was later revealed to suffer from clinical depression).

At the beginning of season 1, Severide is at loggerheads with Matthew Casey over the death of a colleague and is plagued with a shoulder injury that puts his career in jeopardy. He hides this from everyone except Shay, from whom he gets painkillers to deal with his injury. When he finally sees a doctor, he is told that his condition is severe and would no longer be able to keep his job. His girlfriend at the time, Renee Royce, tells him of an experimental procedure, which he undergoes to save his shoulder. After the injury a Paramedic Candidate also threatens his career with a false allegation of sexual harassment, although the charges were dropped after Antonio Dawson runs a background check on her and discovers that she was a fraudster.[3] In Season 2 Kelly discovers he has a half-sister, Katie Nolan, who is a culinary student. He tries to reach out to her but she was initially hesitant as she and her mother had been abandoned by his father Benny. The two become close and Kelly is shown to be very protective of her. In the episode "Tonight's The Night" of season 2, Katie is kidnapped and Severide tries to find her in the following episodes. After she is found, she leaves for Colorado. When Katie's kidnapper disappears, Severide becomes a suspect. However, Benny Severide is revealed to be responsible but is let off by Detective Voight after Benny explained himself.

In Season 3, Severide has plunged into grief with Shay's death during a call (later discovered to be murder and arson).[4] He and Gabby Dawson aid Detective Voight's team in the preliminary investigations, which led them to a series of unsolved arson cases, including the fire that killed Mills' father and seriously injured Chief Boden. The case crosses-over into the Chicago P.D. episode "A Little Devil Complex" and the perpetrator is killed by Antonio Dawson. Severide moves in with Casey and Dawson and avoids the apartment he and Shay shared as he is unable to face the loss of his best friend.

Severide is demoted in season 4 as part of Chief Riddle's plan to make Fire Commissioner by replacing Severide with Captain Dallas Patterson and then ousting Boden as Battalion Chief.[5] The men of Squad 3 remained loyal to him despite Patterson's efforts to win them over. Severide has a tough time during his demotion, constantly being undermined by Patterson, who he has been replaced by. Patterson ordering him does not sit well with him as he has a hard time accepting that he's no longer Lieutenant. He even gets suspended for a shift for threatening to hit Patterson when he tries to talk to him after shift. He and particularly Gabby think Dallas is trying to replace everyone/get them all fired. Patterson doesn't understand this accusation when he is asked several times as he's shown to have a hard time understanding what he's doing wrong as he is only trying to do his job but the fact that he is slightly unfriendly makes them all wary of him. Benny gives Severide a file on him to ultimately blackmail Patterson, Severide decides to hand the file to him. Patterson still doesn't understand why he would give it to him but he helps to calm Riddle down after Boden charges at him with accusations, which Severide is surprised to see. He[6] and Boden are later reinstated as Patterson was revealed to have used his connections to Riddle to implicate the latter for corruption.

In a Chicago PD crossover episode "Don't Bury this Case", Severide is accused of a hit-and-run accident, which later turns into a vehicular homicide when one of the victims, a child, dies from her injuries. Lindsay and Voight suspect that Severide was set up while friendships and relationships are put to the test as the detectives and cops are forced to toe a very thin line with their friends at Firehouse 51 as the evidence against Severide mounts. When his drug and alcohol abuse from his past came to light, detectives within Intelligence were skeptic in believing his innocence.

Severide temporarily blames Cruz for Herrmann getting stabbed by Freddy for bringing him to the firehouse in the first place and pressures him in to finding Freddy when he runs away. This is until Chief Boden tells him to back off, which he takes into effect immediately as he goes to look for Cruz when he then tries to find Freddy at their 'gang hideout' and tells him to not risk his life unless he wants to be the one in the hospital. Kelly also develops a brief attachment to Bianca Holloway at CPD when he tries to tell her that a missing body they find is a young girl who disappeared from his neighbourhood a few years ago. She is initially irritated at his efforts in trying to identify the girl and tells him to back off. However, Severide is right and later on, she asks him for a favour - to look after her son JJ - while she prepares for a court hearing on a dangerous gang she had been detecting for some years. He agrees but doesn't know about this until Antonio tells him about it. She tells Kelly she's worried for her son's safety and wants Kelly to look after him. He tells her she can drop him off anytime.

On the day of the hearing, she drops JJ off with Kelly for a few hours. However, CPD is soon at the firehouse and informs Severide that Detective Holloway was shot outside the court. He is upset to hear this but insists that JJ stay with him until his aunt, who has requested not to tell JJ about this, has flown in from California. The officers agree and tell him to stay put. The firehouse help JJ with a school project, trying to divert his attention from his mother, who he keeps asking to call. They let him film them for his 'Day In The Life of a Firefighter' documentary and he tells them that now, he just has to film his mom. A few hours later, Detective Crowley from CPD is back to tell him that Holloway died during surgery. He still insists that JJ stays with him until Mary (Bianca's sister) is here and doesn't let the other officer take him. Mary arrives later that night and clearly upset and crying, asks Kelly to help her break the news to JJ. They take him to the briefing room next door and tell him with the whole firehouse watching from the window in the common room. He breaks down and Mary takes him away. Just before he leaves, Severide gives Pouch, their dog who has also grown close to JJ, to JJ as he cries in the car. He tells him he can visit or call anytime.

Most significantly, all of firehouse 51 collectively disagree and are against Jimmy's angry attitude about a decision Chief Boden made at a fire that Jimmy believes killed his brother. After filing a report against Chief Boden and consequently being transferred back to Truck, Severide and Casey are especially irritated by his actions. This causes them to practically ignore him during their next call and he takes the rash decision to go in despite orders and gets severe burns. Chief Boden~ sees him in hospital one last time before he leaves.

Severide next has a disagreement about whether a man started a fire in their apartment to kill his wife or not. Severide says he didn't start the fire because of the way the husband kicked him off to go in the burning building to save his wife. Casey disagrees, as he is the one who held the wife's hand seconds before she died and also found evidence of arson. Severide tries to prove the husband's innocence but is proven wrong in the end, after the husband admits to starting the fire but didn't know that his wife was inside at the time.

Severide later has trouble with his relationships and starts thinking about his life. He is then injured in an accident and doesn't get it checked out until Chief forces him to. He meets Chicago Med's Dr Clarke - a past friend of his, who asks him to take a quick blood sample and enroll on the bone marrow registry. He brushes it off for later and leaves. Clarke comes to see him the next day and says that the reason for his asking was a cancer patient of his, who is dying and needs this and he thinks Severide could be a match because of something he told him earlier. Severide again, brushes him off and finds it strange. However, he goes to see Clarke after Gabby and Casey get married. Clarke shows him the woman and Severide instantly agrees. Clarke tells him he'll feel the pain for months, to which he replies, "good".

In season 8, Severide is offered a temporary position as an investigator for the Office of Fire Investigation (OFI). He initially turns it down, but he is later assigned to the Office of Fire Investigations at the request of Fire Commissioner Grissom (Gary Cole). Severide goes to Grissom to confront him about the assignment, but Grissom convinces him to accept the assignment, and Severide asks for Grissom to shut down the investigation into Christopher Herrmann after he confronts a Chicago Police officer during a call. In the episode "Stand Our Ground", he returns to 51 after his stint at OFI.