Draft:List of The Rookie characters

The Rookie is an American television series, based on real-life LAPD officer William Norcross, who moved to Los Angeles in 2015 and joined the department in his mid-40s. The series stars Nathan Fillion as John Nolan, a man in his forties, who becomes the oldest rookie at the Los Angeles Police Department (LAPD). Other cast members include Alyssa Diaz, Richard T. Jones, Titus Makin Jr., Melissa O'Neil, Afton Williamson, Mekia Cox, Shawn Ashmore, and Eric Winter.

John Nolan
Jonathan "John" Nolan (portrayed by Nathan Fillion)  is the main character of the series. The oldest rookie at the Los Angeles Police Department (LAPD), he is assigned to the Mid-Wilshire Division. He is divorced with a son, Henry. Nolan became a training officer in the later seasons to teach the next generation of cops and help make positive change in the LAPD.

In the pilot episode, Nolan got caught in the middle of a bank robbery. However, he distracted one of the robbers that resulted in the police arriving to arrest the robbers. This inspired Nolan to become a police officer. Following the bank robber incident, Nolan packed up his belongings, and moved to Los Angeles six months prior to becoming a rookie officer for the LAPD. Though his first day on the job went in a mixed turnout, Nolan stood his ground to remain on the LAPD, despite Sergeant Grey promising to put pressure on him to perform as a cop.

At the end of "The Ride-Along", Nolan chatted with his son online, who later came to visit him in "Flesh and Blood". In "Time of Death", when a robbery happened at a local store, one of the two suspects ran away into a nearby house to fight off the police by holding a family hostage. Nolan managed to usher the family out the door, whilst he went upstairs to arrest him. The robber refused repeated orders to surrender and pointed a gun at him, causing Nolan to shoot him in self defense. He was pronounced dead when Bishop enters the room, calling off the ambulance. Nolan had a hard time trying to make peace with his death, particularly that he directly (or in some other ways, indirectly) caused the robber's death. It was apparent when his brother, the other robber made an announcement stating that Nolan killed his brother in cold blood and broke into his house in revenge. During "Standoff", his life was once again in jeopardy yet he managed to fend himself until the police arrives. After he was suspended, a worried Lucy came to Nolan to comfort him, despite leaving their relationship on hold. After a quick drive, both of them were seen hooking up in Nolan's house, thus saving him from being killed. Lucy was anxious about the colleagues from Mid-Wilshire arriving at the crime scene and knowing that they slept together. Nolan convinces Lucy to run, and not let IA know about their relationship. Nolan was eventually cleared of duty in "Flesh and Blood", after aiding his friends to take down a serious drug dealer and his crew. His actions were moved by Commander Percy West who cleared his case. He and Lucy were also on good terms.

During the first part of the season, Nolan originally stayed in the guest house of his old college roommate, Ben McRee. After his first appearance in "The Roundup", Ben seemed to have resumed his residence in Los Angeles. After arriving in Los Angeles, Nolan told Ben that the incident with bank robbers seen in the "Pilot" episode had inspired him to become a police officer ("The Checklist"). Nolan was also secretly dating fellow rookie Lucy Chen. They managed to keep it an underground relationship but Nolan's T.O. Talia Bishop saw right through them, telling Chen to break things off before it's too late. He was reluctant but realized it was for the greater good, so they broke up with each other in "The Switch". By the time of "Green Light", Nolan was apparently seeing Jessica Russo.

His training officer in Season 1 was newly-promoted LAPD Officer Talia Bishop. However, after her move to the Department of Alcohol, Tobacco, and Firearms, Nolan's training officer until the first episode of Season 4 was former undercover Detective Nyla Harper. He married Bailey Nune in the sixth season.

Nolan's badge number is 25253, which he states in the episodes "Green Light", "Consequences", "Fire Fight", and "Under Siege".

Angela Lopez
Angela Lopez (portrayed by Alyssa Diaz) is a Police Detective since season three. In season 1 and 2, she was a Police Officer III assigned to the Mid-Wilshire Division as the training officer for Jackson West. They usually worked the 7-Adam-07 beat. In Season 3, Lopez is promoted to Police Detective I.

In "Flesh and Blood", Lopez butted heads with a lawyer from the Public Defender's Office, Wesley Evers, but at the end of the episode Wesley asked her out. After several clashes and misunderstandings, they seemed to be back together in "Homefront", flirting in the break room and playing footsie under the table in Interrogation.

In Season 2, Evers moveed into Lopez' place and they clashed over their wildly differing housekeeping styles. Lopez finally got to meet Evers' mother Patrice, thereby discovering that Evers' family was wealthy. Nolan was assigned to ride with Lopez in "The Bet", as he was without a training officer and West was assigned to ride with Officer Smitty. In "Warriors and Guardians", Nolan was assigned to returning patrol officer Nyla Harper, and Lopez and West got back to being partnered together.

In "Hand-Off", it was revealed that Lopez and her training officer were the first on the scene after Wade Grey and his partner Dennis Rowland were shot by Russell Scanlin. Grey was seriously injured and Rowland died in Lopez's arms. It was Lopez's first shift on the job as a rookie, and the incident occurred 10 years prior to the events of the series. She also had nightmares about that day although during the episode, she mentioned they had become less frequent now.

In "The Overnight", Evers proposed to Lopez, and she happily accepted the proposal.

In the season 3 premiere "Consequences", Lopez was revealed to be pregnant and also is informed by Grey that she has been promoted to Police Detective I.

In "La Fiera", Lopez's unborn child received a gift from drug queen pin Sandra de La Cruz, nicknamed "La Fiera".

In "Sabotage", Evers revealed he had a genetic predisposition for Fragile X syndrome that could affect their unborn child. In the next episode ("Lockdown"), Lopez had an amniocentesis a week before scheduled so she can know the results before Evers. Lopez rationalized that Evers knew about his genetic disposition for weeks without telling her.

On Jackson West's last day as a rookie, Lopez temporarily returned to her original position as Training Officer. She rode with him, saying, "We started this journey together. I think we should finish it together."

In "Man of Honor", Lopez enlisted Tim Bradford as her "man of honor", as he was determined to help her have the wedding she really wants.

Lopez and La Fiera remain on friendly terms until La Fiera's son was killed in "Brave Heart" by Cesar Madrigal's hitman after La Fiera took over his father's cartel following his father's death.

In "Threshold", after a series of unfortunate events interfere with her wedding plans, she gave up on her plans and tasked Bradford and friends with setting up a wedding in two days. Bradford and friends accomplished the setup beautifully - Bradford said, "You could save my life three times and you would still owe me". After La Fiera was arrested, Lopez visited her in her cell prior to the ceremony, and Lopez blamed her for her son's death, causing an enraged La Fiera to orchestrate her release from a prison transport while the cartel who had freed her kidnapped Lopez just as she was preparing to walk down the aisle.

In the season 4 premiere "Life and Death", Lopez was abducted and along with Jackson, who was shot and killed while trying to save her. Lopez was held hostage by La Fiera, who planned to take Lopez's baby once it was born and kill Lopez. Once her LAPD colleagues rescued her, Lopez's shot was the one that killed La Fiera during their escape. After a brief time jump or "Three months later", it was shown that Lopez had safely given birth to a baby boy and named the baby Jackson, after her former rookie. She paid respect to Jackson's grave and wished he could've been around to see her son.

Lopez's badge number is 29842 in Seasons 1-2. Following her promotion to detective in Season 3, her badge number changed to 1777.

Wade Grey
Wade Grey (played by Richard T. Jones) is the Watch Commander at the Mid-Wilshire Division. He is a Police Sergeant II. Grey served in the United States Army prior to joining the LAPD. He has a daughter who is attending college in New York City.

Grey initially saw Nolan as a "walking midlife crisis" but eventually decided to reserve judgment rather than run Nolan out of the force immediately.

Ten years before the events of the first season, Grey was shot the last week he served as a patrol officer. He spent two weeks in ICU; his partner, Dennis Rowland, was killed by the same bullet that injured Grey. They were shot by Russell Scanlin, who was high on drugs at the time. Angela Lopez was a rookie officer at the time the incident occurred and was at the scene with Grey while Rowland died in her arms.

Grey's badge number is 6325.

Jackson West
Jackson West (portrayed by Titus Makin, Jr.) was a Police Officer I assigned to the Mid-Wilshire Division. His training officer was Angela Lopez during Seasons 1-2. His training officer in Season 3 was Doug Stanton during episodes 2-5. Quigley Smitty also routinely filled in as his training officer whenever Lopez was not available. In "Amber", West was promoted to Police Officer II. West and his training officers usually worked the 7-Adam-07 beat.

An eager, if somewhat naive, rookie and the son of Commander Percy West, head of the LAPD's Internal Affairs Division. Top of his class at the Police Academy, he was firmly committed to the LAPD and strived to be the best officer he can as he wanted to maintain his family's traditions.

In the pilot episode, West initially struggled with firing his weapon, as he was afraid of doing so. At the end of the pilot, Lopez covered for him when Captain Andersen asked him why he didn't fire his weapon, as she didn't want to be blamed for his failure.

In "The Switch", West was assigned to Lucy's TO, Tim Bradford, who learned of his struggles when he froze during a shootout. Bradford angrily confronted Lopez, as she let him go on patrol with a "broken rookie". Bradford later took West to a man who had not left his apartment since a hate crime occurred against him and the man helped West overcome his fears. West later saved Bradford's life during a shootout at a supermarket involving several drug dealers, impressing Bradford.

Jackson was killed in the season 4 premiere "Life and Death" while trying to protect Lopez from Sandra de la Cruz' men. Lopez named her newborn son after Jackson in his honor.

West's badge number was 33356.

Zoe Andersen
Captain Zoe Andersen (played by Mercedes Mason) was the Commanding Officer of the Mid-Wilshire Division. She used to be a Marine, serving with the military police.

After leaving the Corps, she spent a year with the United States Pentagon Police Criminal Investigations Directorate before joining the LAPD. Because of her prior experience, Andersen has risen up the ranks very quickly, to the point where some of her officers see her more as a boss than a fellow officer. Andersen was killed in the line of duty trying to protect Nolan from a vengeful gang leader.

Andersen's badge number was 898.

Lucy Chen
Lucy Chen (played by Melissa O'Neil) is a Police Officer I assigned to the Mid-Wilshire Division. Her training officer was Tim Bradford until she was promoted to Police Officer II during the episode "Amber". She usually worked the 7-Adam-19 beat.

An ambitious rookie who struggles to prove herself to Tim Bradford, her training officer. She is 29 years old, and her parents are psychologists who remain opposed to her choice of career. O'Neil also stars as Lucy's doppelganger "Juicy" in later seasons. She later qualifies to become an undercover officer and starts dating Tim.

Chen's badge number is 28537.

Talia Bishop
Talia Bishop (portrayed by Afton Williamson) is a Special Agent for the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) and a former LAPD officer. She had been promoted to a Police Officer III and assigned as a training officer in the Mid-Wilshire Division. Bishop was the training officer for John Nolan in Season 1.

Bishop's badge number was 27459.

On August 4, 2019, it was announced that Williamson would not be returning for the second season due to the alleged racial discrimination, sexual harassment, and sexual assault she suffered during the first season.

Tim Bradford
Timothy "Tim" Bradford (played by Eric Winter) is a police officer is assigned to the Mid-Wilshire Division where he worked as the training officer for Lucy Chen until Lucy was promoted in the episode "Amber". Bradford and Chen usually worked the 7-Adam-19 beat. Bradford's badge number during Seasons 1-3 was 34831, which he stated during a phone call in the episode "Casualties". When he is promoted to Sergeant I in Season 4, his job role is a Patrol Field Supervisor and his badge number is changed to 3483. In Season 5 Bradford joins the Metro Unit (an LAPD armed response unit).

A strict, no-nonsense training officer, Bradford used to be a Marine squad leader who served in Iraq and Afghanistan before joining the LAPD. Winter also stars as Tim's doppelganger 'Dim' in later seasons. He gives up patrol duties to have a relationship with Lucy and becomes a Metro officer.

Nyla Harper
Detective Nyla Harper (portrayed by Mekia Cox) is a Police Detective I who previously worked undercover for four years. After her undercover operation, she received a "Golden Ticket", which allows her to choose her assignment, and requested to be assigned to the Mid-Wilshire Division as a training officer. She was John Nolan's training officer following the departure of Talia Bishop from seasons 2-3. She trained Aaron Thorsen in Season 4 before returning to a detective position in Season 5 as Nolan became the newest Field Training Officer for the Mid-Wilshire Division.

Harper's badge number is 56464.

Wesley Evers
Wesley Evers (played by Shawn Ashmore) is the husband of Angela Lopez. A recurring character in Seasons 1-2, he became a main character in Seasons 3-6. Wesley was a defense attorney in Seasons 1-4 and became an assistant district attorney in Season 5.

Bailey Nune
Lieutenant Bailey Nune (played by Jenna Dewan) is a Firefighter with the Los Angeles Fire Department. She holds the rank of 1st Lieutenant in Army Reserve. She was a recurring character in the third and fourth seasons until she was promoted to a main character beginning in "Heart Beat". She is also a main character in the fifth and sixth seasons.

Aaron Thorsen
Aaron Thorsen (played by Tru Valentino) is a former internet celebrity who was involved in a murder case in which he was found not guilty. He is a recurring character in the fourth season and a main character in the fifth and sixth seasons. His badge number is 14483, and his training officer in Season 4 was Detective Nyla Harper. After Harper went on maternity leave in Season 5, John Nolan helped to finish his training before he was promoted to Police Officer II in "Dye Hard". Thorsen and Harper's call sign was 7-Adam-19.

Celina Juarez
Celina Juarez (played by Lisseth Chavez) is Nolan's enthusiastic new rookie. She causes trouble for Nolan as he believes she is too superstitious. She joined the Academy in order to solve her sister's murder and disappearance. Her badge number is 53362.

Isabel Bradford
Isabel Bradford (portrayed by Mircea Monroe) is Tim Bradford's ex-wife. She is a former undercover narcotics officer who became a drug addict.

Nell Forester
Nell Forester (portrayed by Sara Rue) is a former dispatcher for the LAPD whom Tim use to bribe in order to get the best calls.

Ben McRee
Ben McRee (portrayed by Currie Graham) is Nolan's friend since their school days. Ben let Nolan stay in his mansion as a house guest during season 1.

Kevin Wolfe
Kevin Wolfe (portrayed by Demetrius Grosse) is a detective who was assigned to Isabel's case.

Elijah Vestri
Elijah Vestri (portrayed by David DeSantos) was a detective assigned to Isabel's case, and Wolfe's partner. He was shot and killed midway during the first season in a shootout with a gang of drug dealers.

Henry Nolan
Henry Nolan (portrayed by Zayne Emory) is the son of John and Sarah Nolan. Henry was born after John dropped out of college to marry Sarah due to her unexpected pregnancy. In the pilot episode, John told Stacy, a bank manager, that he and Sarah had agreed to stay together until Henry went to college. This is what Henry was pursuing at the beginning of the series. Henry is engaged to Abigail, whom he met at college and whom he brought to meet his father in "Tough Love". Abigail dropped out of college in Season Two, and in Season Three Henry told his dad that he too had dropped out of college to take a job with a global charitable organization run by Ben McRee.

While Henry was in Los Angeles training for his new job, he passed out and was taken to the hospital, where he found out that the surgery he had as a child had caused problems in adulthood. He had a choice between a less invasive procedure, which would have to be followed up with a major operation in five years, or open heart surgery to replace his failing heart valve. In spite of the prospect of a long recovery and giving up his new job, Henry decided to have the open heart surgery. At the end of "Brave Heart", Abigail, John, and Sarah were overjoyed to hear that the surgery went well and that Henry would make a full recovery. Henry eventually met Bailey Nune, his dad's girlfriend, over FaceTime, in "Breakdown".

Percy West
Percy West (portrayed by Michael Beach) is Jackson West's father and the commander of Internal Affairs. He made his first appearance in the season 1 episode "Time of Death", where he questioned Nolan about the shooting and killing of Alex Montgomery.

Quigley Smitty
Quigley Smitty (portrayed by Brent Huff) is a very lazy police officer who lives in a trailer parked across the street from the Mid-Wilshire station. His first name was teased on Eric Winter's Instagram story, where a union vote ballot revealed his first name to be "Quigley". This was confirmed in the season 4 episode "Real Crime". Smitty has made the most appearances of any recurring character on The Rookie, appearing in 44 episodes.

Chris Sanford
Chris Sanford (portrayed by Kanoa Goo) is an assistant district attorney, and Lucy Chen's ex-boyfriend.

Sanford first appeared in "Heart Beat", where he encountered Lucy Chen at the precinct and revealed he was prosecuting Tyler, the young drug dealer who she and Bradford arrested. Lucy defended the young man, but Chris was unconvinced that he could be redeemed, leading to an argument. He later informed Lucy that because she allowed Tyler to go free that he robbed a store and caused the clerk to have a heart attack.

In "End Game", he met Lucy again and she revealed the clerk survived, something he heard from sources. Unlike before, he was willing to show leniency by having Tyler act as CI and implicate his boss, Curtis. Lucy did not like the idea, as Tyler would be in serious danger if he did so, leading to another argument. Chris later met with Jason Wyler who had turned himself in to make a deal of turning on his criminal boss, in exchange for lesser time. Chris had him admit his harassment of his estranged wife, planting drugs, and violating parole.

Bradford set Chris up on date with Lucy for a double date with him and Ashley McGrady in "The Knock". It was an awkward date because Lucy and Bradford mostly talked while leaving Chris and Ashley silent. Later, he stated he did not like being a third wheel and Lucy apologized for making him feel like that and offered another date. He agreed and took her to a hot dog spot, which happened to be her favorite place.

During "Hit List", he and Lucy were confirmed to still be dating but in debate over whether they were a couple. When Sergeant Grey was attacked and other witnesses for a murder case against a crime lord named Matteo Rubio end up murdered, Chris and the police realized that Rubio had assassins silence the witnesses. He later tried to get Lucy the list of witnesses to stop the spree, but she refused to take it because she didn't want to jeopardize their careers and he understood. That night, he went over the case with Sean Del Monte, before he got a call from Lucy warning him that the assassin were after Del Monte and that Chris was in danger too, before the building's power shut off. The shocked Chris notified Lucy that he saw the killer enter and quickly warned Del Monte to get down before they were shot at. The two managed to evade the killer long enough for the police to arrive and arrest him. Afterwards, he was tended to by Lucy who was pleased he survived the ordeal. She later asked if the list was a way for him to impress her, while he jokingly asked if it worked.

In "Coding", he brought Lucy in to testify against serial killer Rosalind Dyer by prepping her for the trial and enabling her to watch her kidnapping by Dyer's follower Caleb Wright. After Lucy watched the whole thing, she was left shaken and worked up the strength to tell Chris that she could not testify, which he understood by saying they had another way to convict her. He took Lucy to dinner, as a way to shift her mind from it. Chris later invited Lucy to meet his mother in "Mother's Day", but she turned it down.

In "Double Down", Chris was kidnapped and attacked by serial killer Rosalind Dyer who abducted him and cut his wrists, while leaving him for dead. He was found barely alive by Lucy and Bradford, before being taken to a hospital.

In "Labor Day", Chris is shown to have survived his ordeal and after his release, he is tended to by Lucy. They joke about his ordeal before a detective arrives to talk with Lucy who turned down an opportunity to do undercover work. Chris questioned this and Lucy tells him she is concerned about him, even though he assures her that he is fine but she refuses to leave his side. Later, he tries again to show her the experience she'd get if she does it but she remains steadfast in refusing. At the end, he is happy Lucy decided to go after all.

By "Dye Hard" a month has passed, with Chris having recovered. He and Tamara Colins celebrate Lucy's completion of undercover school and she is appreciative. When he goes back to work, Lucy realized that he might be too focused on taking down Rosalind and has Wesley Evers keep an eye on him to ensure he doesn't go overboard. Chris had noticed Wesley has been hovering and noted what Lucy was doing but understood because he was fixated.

In "The Collar", Lucy realized that she did not want to be with Chris anymore after he wanted them to move in together, and by the end of "Take Back", Lucy had broken up with him.

Luna Grey
Luna Grey (portrayed by Angel Parker) is Wade Grey's wife and mother of their daughter Dominique.

Jessica Russo
Jessica Russo (portrayed by Sarah Shahi) is a former FBI hostage negotiator who now runs her own security firm and is a published author. She later took a job with the Department of Homeland Security while she briefly dated Nolan. They separated when she realized he was not ready to have more kids.

Oscar Hutchinson
Oscar Hutchinson (portrayed by Matthew Glave) is a prisoner who escapes from a prison bus crash but is later apprehended by Lopez and Jackson. Oscar eventually helps the precinct officers as an informant on several cases including former prisoners.

Nick Armstrong
Nick Armstrong (portrayed by Harold Perrineau) was a night detective who assisted the LAPD Mid-Wilshire Division. His badge number was 2075.

Armstrong was previously assigned to the 77th Division for ten years; he took on night work after his wife died five years ago. It took him four years to reach detective grade, the only cop to have done so. Armstrong lost his wife to cancer five years before his first appearance in "The Night General", and he regretted that he spent more time on the Rosalind Dyer case than on his wife before she died.

He was initially depicted as a friendly cop, eager to help the team. Armstrong and John Nolan even bonded on their ride along with him catching on to Nolan's attraction to his former college girlfriend, helping John with his house, and looking into his son's fiancée.

Armstrong once got abducted by Rosalind Dyer's pupil Caleb Wright. However, he was saved by the other officers.

In the last two episodes of season 2, Armstrong was revealed to be a dirty cop who was supplying a gang with Department secrets and ended up killing a fellow officer to keep her quiet. After Nolan discovered Armstrong's secret, he met with Armstrong, who told him that he planned to frame him before Armstrong took a shot, and Nolan shot Armstrong in self-defense.

In the season 3 premiere "Consequences", Armstrong landed in the hospital after Nolan shot him, and he accused Nolan of trying to kill him. He planted the evidence in Nolan's house to make him look like the dirty cop, and he also accused Nyla Harper of being in on it. Nolan, panicking, ran to his home to find the evidence Armstrong planted. He found it and hid it in the water heater. When the LAPD finally got a warrant to search his home, he immediately surrendered himself to Sergeant Wade Grey, and was later interviewed by Commander Percy West of Internal Affairs. After Nolan convinced Internal Affairs that he was not dirty and Armstrong was, Armstrong fled the hospital. Nolan discovered the location of the gang that Armstrong was with and offered to wear a wire and pretend to want to deal with the gang. Nolan later found a still wounded Armstrong and the gang at a junkyard. Armstrong aimed a gun at Nolan's head, but the gun was not loaded. Nolan made a run for it when this happened, and the gang members opened fire on Nolan, also killing Armstrong in the crossfire. Nolan survived and arrested Ruben Derian, with Armstrong bleeding out, on the scene.

Sterling Freeman
Sterling Freeman (portrayed by Daniel Lissing) was a celebrity actor starring in a police procedural show, who briefly became Jackson's boyfriend before he was revealed to have been a former criminal named Skipper Young.

Grace Sawyer
Grace Sawyer (portrayed by Ali Larter) is a doctor at Shaw Memorial Hospital and Nolan's ex-girlfriend in season two. She and Nolan briefly rekindled their relationship.

Donovan Town
Donovan Town (portrayed by Enver Gjokaj) is Nyla Harper's ex-husband and Lila's father. He and Harper were fighting over joint custody of Lila.

Lila Town
Lila Town (portrayed by Carsyn Rose) is Harper's daughter from her marriage to Donovan.

Abigail
Abigail (portrayed by Madeleine Coghlan) is Henry Nolan's fiancée. She and Henry met at college and eventually show up at John's house to announce their engagement. John later discovered that Abigail was previously arrested for torching her ex-boyfriend's car after he posted revenge porn online. She had an interest in joining the LAPD and requested a ride along with Nolan. She eventually changed her mind after she and Henry were held hostage, but her arson charge probably would've prevented her recruitment. In "New Blood", Abigail accompanied Henry on his orientation for his new job as part of Ben McRee's charitable foundation, and in "Brave Heart" she stayed by Henry's side as he underwent medical treatment for his heart condition.

Rosalind Dyer
Rosalind Dyer (portrayed by Annie Wersching) was a serial killer and nemesis of Nick Armstrong, the officer whose arrest led to her conviction for murder. She was being held on a life sentence serving her sentence at the Central California Women's Facility.

She first appeared in "The Dark Side", when she arrived at the Mid-Wilshire station after making a deal with the assistant district attorney Sean Del Monte in order to find the bodies of her victims that were never recovered. Her history with Armstrong was revealed in the episode; while Armstrong was on the task force that had arrested her five years earlier, his wife had died while he was trying to catch Dyer.

In "Day of Death", Nolan and his training officer Nyla Harper returned to the prison to confront Dyer after Lucy Chen was abducted. Nolan tried to convince Dyer to give up the location of Caleb Wright, the other killer, but Dyer told him that Wright's kills were her kills as well. The team later found out that Wright had sneaked into the prison on multiple occasions, and had given contraband items to Rosalind so that they could communicate with one another. Nolan later returned to speak with Dyer, and Dyer revealed that killing Chen was never the endgame. When Nolan asked her what was, Rosalind corrected him saying "Not what, but who". From that, the LAPD team deduced that Nick Armstrong was her ultimate target. After Nick and Lucy were found, and Caleb was killed, Nolan returned to the prison and revealed to Dyer that they had recovered Wright's notes, meaning that they now knew everything about her crimes, and that she no longer had any secrets. As Nolan prepared to leave, Dyer revealed that she had one last secret about Armstrong, but Nolan did not believe her.

Dyer appeared again in "The Hunt", where Nolan, seeking explanation for Nick's suspicious behavior, came to the prison to ask her about Nick's secrets. Dyer was just as manipulative as always, but she did drop hints for Nolan as to where to look for evidence about Nick's actions. After Nolan was detained in "Consequences", Tim Bradford and Chen tried to get a statement from Dyer about what she and Nolan discussed, hoping to find some insight into Armstrong's situation, but all they got was Dyer gloating over Chen's trauma and one small hint about Armstrong's methods. She used a hidden cell phone to call a couple of key characters to gloat some more.

In "Double Down", Dyer escaped from custody en route to being tried for the crimes committed by her associate, Caleb. She was aided by an attorney Beth Veston whose admiration for her motivates her to kill a guard and divert the police into chasing her, thinking she was Dyer. Dyer rewarded that admiration by killing Veston's parents, the two people the attorney wanted dead, once again escaping the police. At the end of the episode, Dyer appeared to be piloting an airplane, destination unknown, as she called Nolan to drop a hint about Chen; it turned out that Chen's boyfriend Chris Sanford had been left to die with his wrists slit - in Chen's apartment.

In "The Choice", Nolan discovered that Rosalind had returned to Los Angeles and, with the help of yet another acolyte, rigged an elaborate trap for Nolan's significant other, Bailey Nune. Bailey fell into a tank that was protected from tampering by several methods, some lethal, and Rosalind's demand was that Nolan hand himself over to her, supposedly in exchange for Bailey. Dyer was shot dead by a sniper at the end of the episode when Nolan was arresting her. The episode marked the last appearance of Annie Wersching who died from cancer on January 29, 2023, at the age of 45.

Emmett Lang
Emmett Lang (portrayed by Jeff Pierre) is a fellow firefighter of the LAFD and a friend of Tim Bradford. He briefly dated Lucy.

Ruben Derian
Ruben Derian (portrayed by Hrach Titizian) was a member of the Derian crime family who recruited Armstrong and Erin Cole to help him destroy evidence that implicated his brother Serj for the murder of Chris Rios.

Doug Stanton
Doug Stanton (portrayed by Brandon Routh) is an ex-LAPD officer, assigned as Jackson West's new training officer in season 3. He was most notable for his racial profiling.

In "Lockdown", when Stanton and West followed a suspected stolen car to an apartment complex known for its criminal residents, and split up to find the driver, West was ambushed and beaten badly by four thugs. Stanton saw the beating, but refused to help West after their snap fight earlier. When Bradford and Chen arrived, he lied to them by saying he didn't know about West getting attacked, but because an LAPD's body cam automatically records the two minutes prior to its activation, Stanton's deliberate inaction was caught on footage, which was then viewed by Grey and Bradford. At the end of the episode, Stanton was placed on administrative leave and made to surrender his badge and gun, pending IA investigation. Stanton returned in "Triple Duty", where he was shown to have appealed his termination and won. With his successful termination appealed, he was reinstated in the LAPD by the Police Commissioner and the Board of Rights, demoted to Police Officer II, stripped of his FTO role and seniority, and assigned to the Hollywood Division. Grey and West reached out to Stanton's new watch commander, Sergeant Stella Porter, who agreed to show her division Stanton's bodycam video footage of the attack on West at the Manor Apartments, exposing Stanton for deliberately refused to take action as a training aid, resulting in Stanton's colleagues changing their opinion of him.

James Murray
James Murray (portrayed by Arjay Smith) is a local resident in the neighborhood where Nolan and Harper were assigned to community outreach. He and Harper began dating during the third season, and during the fourth season, she ended up pregnant. He proposed to her in Season 4 after declining her initial proposal, in which they got married at the courthouse.

Fiona Ryan
Fiona Ryan (portrayed by Toks Olagundoye) is a professor in Ethics and Criminal Justice. Nolan attends her night classes in order to finish school and qualify as a training officer. She is also a well-known activist, specifically in civil rights and police reform, and has authored a book about racial inequality in the justice system.

Tamara Colins
Tamara Colins (portrayed by Dylan Conrique) is a homeless high school student Lucy took under her wing and tried to help cope with her situation. They later became roommates after she took Jackson's room following his death.

Sandra de La Cruz
Sandra "La Fiera" de La Cruz (portrayed by Camille Guaty) was a Guatemalan businesswoman and drug lord, who had a vendetta with Lopez after multiple encounters. After her son Diego was murdered by a rival gang, she later kidnapped Lopez with the intent of taking Lopez's newborn. However, Cruz was shot dead after Harper and Tim helped Lopez escape.

Elijah Stone
Elijah Stone (portrayed by Brandon Jay McLaren) was a crime boss who forced Wesley to be his crooked lawyer in order to retrieve Angela Lopez from Guatemala.