She's Walker's new partner who was born and raised in San Antonio. Described as focused and perceptive, her family has been in Texas since before it was Texas. She's been in the Army and on the police force and knows first-hand what it's like to be singled out and discriminated against because of her gender.
Nina Ruiz was born to Mercedes Ruiz in New Mexico during the 1980s-1990s. Mercedes, unable to care for her daughter, left her in the care of Adriana Ramirez, her sister. Mercedes then checked into rehab for a stint that was supposed to last three-months. Three years later, Nina had grown up believing Adriana to be her biological mother, so when Mercedes returned, Adriana paid her sister to leave them alone.
Adriana moved to Texas with Nina and legally changed their surnames. She also changed Nina's name to Michelle "Micki" Ramirez. When Micki inquired about the origin of her nickname, she was told that Adriana thought she would have a son. As she grew up, Micki felt a strong desire to help the world and others in her circumstances through law enforcement, despite the idea being strongly discouraged by Adriana. Micki enlisted in the military against her mothers wishes. While in the military, Micki met army medic Trey Barnett. In the meantime, her relationship with Adriana further strained when Micki became a state trooper. Adriana ceased communication with Micki, though she still maintained a watchful eye on her movements. In 2020, Micki's promotion to Texas Ranger made her one of the few women in the field, and one of the first Mexican American rangers.
In Pilot, state trooper Ramirez is assigned for a wellness check at the lookout at Lady Park Lake. She pulls up and asks for the visitors license. He obliges after a witty remark. She takes him home as he can pick his truck up in the morning. He struggles to fit in the backseat as they talk about his unplanned trip to the lookout. He claims he’s still carrying the work with him so he decided to visit a ghost instead. His rambling leads her to believe he was undercover. He introduces himself as Cordell Walker, Texas Ranger. She drops him off his house as this is her last good deed as a trooper, explaining that she just got promoted. She gives him his keys back with a smirk.
Walker heads to work where he greets Larry James, his former partner who is now his Captain. Ranger Micki Ramirez remarks that something spooked him, as James elaborates that because an officer was attacked they called in the Rangers. He introduces Micki who is Cordell’s new partner, and the officer who drove him home last night. James notes that Walker just closed the Rodeo Kings case, to which she goes to ask him a question but Walker shoots her down as he doesn’t want to talk about it. James tells her to fill Walker in on where she’s at and walks off. Walker notes that he has some catching up to do.
Walker and Micki eat lunch as he congratulates her on the promotion. She explains that Captain gave her patrol to do some recon on Walker, and he asks for her report. She explains that he’s the edge of a coin - not quite heads or tails just his way. She has a lot riding on the job and doesn’t want him to mess it up. He asks why she wanted to do this job, but she felt it was something she had to do even though it burned bridges with her family. He notes that Curtis was scared and she theorizes that he was afraid of something in the truck. He suggests they go through the traffic cam footage, but she knows that he means her. He quips that she doesn’t seem like the type to want special treatment.
Micki comes home to find Trey’s duffle bag on the floor. The two reunite with a hug and a kiss, as he’s staying for two-weeks. He wants to know one thing about her day to which she explains that her new partner is a mess. He served as a marine after 9/11 and he recently lost his wife. She’s trying to understand him but Trey wants her to be in the present. They begin to flirt over Micki’s new buckle.
Walker and Micki meet in the office where she tells him about the car she spotted on the traffic footage. The car comes from a company called Green Thumb & Grace, a rehabilitation center for former criminals. They head to the store where Walker picks up a ceramic cross, pretending to talk to JC about his kids going to Sacred Heart. Micki is unamused by his antics, though he tosses it to her when Milo and his sister, Cheryl, approach them. Micki has him confirm that the truck is the company’s and they direct the rangers to Jordan and Alex.
Jordan recognizes Walker as the Ranger with the dead wife who was shot by the border, while Micki watches his reaction closely. He snidely remarks that Walker couldn’t protect her. Walker quips back that he won’t be engaging with a low-life sparking Jordan to swing at Walker. Walker gains the upper hand and slams him repeatedly into a crate, though Micki pulls him off angrily. Walker’s hand is sliced open from the fight. Micki arrests Jordan while Walker storms off to bandage his wound.
Micki brings Walker to her house where she criticizes his handling of the situation while trying to find something to bandage his wound. Trey emerges from the kitchen and she introduces the two men, with Trey recommending more than antiseptic. She goes with Trey’s recommendation as he’s a medic, not her. Walker tries to justify his actions but his antics don’t entertain her. Trey returns and bandages his hand while Micki chews Walker out, with Walker making quick remarks back, much to Trey’s amusement. Micki storms out to return to work.
Walker returns to work where he fills Micki in on the situations with the Munoz family and Stella, which frustrates Micki as she disagrees with the deportation risks. He is going to have Liam, his ADA brother, speak to the feds to speed up their papers. She explains that she isn’t speaking to her mother as she disagrees with Micki being an officer. To change the subject, Micki tells Walker about the intake interviews with Jordan and Alex. Alex requested extra protection upon his arrest out of fear. Walker thinks the charitable business is a good cover and remembers Officer Curtis dusting himself off after falling into the back of the truck. He asks if she still has the figurine she swiped. When they run it underwater they find a small bag of heroin inside, confirming their suspicions that the cartel is involved. Micki refuses to let Walker come as he needs to be with Stella. He hurries off to find his daughter.
Micki goes to the Green Thumb & Grace with an officer to confront Milo about the drug operation. Milo acknowledges that Jordan and Alex weren’t ready for the program, but Walker interrupts as he walks up that the pair were on a heavy packing and shipping schedule. Cheryl emerges and things escalate quickly as she pulls a gun on them. Micki kicks it out of her hand and they chase her down. Walker pushes over rows of shelves to block the van while Micki tackles Cheryl to the ground and arrests her.
The partners visit Captain James to brief him about their arrest. James tells them that by taking down Clark’s ring, they unearthed a bigger link to the cartel. He offers Walker a job with a task force effectively immediately, while Micki will stay in Austin as a Ranger. Walker is honored though he has to think about it. Micki is happy to stay and continue her job. James then tells Walker the way he handled the suspects earlier won’t be tolerated and created an unneeded mess. He tells Walker to do better.
In Back in The Saddle, Micki and Trey kiss on her bed but a call from Captain James distracts her much to his chagrin. She is called into work despite his protests and tries to call Cordell but he doesn’t answer. She gets dressed though she notices he brought a lot of gear with him, he dismisses it as him having a longer leave. He wants to spend it with her but she is apprehensive as he’s never stayed for more than a few nights. She needs to focus on her job with him teasing that he’s a distraction.
Walker goes to the crime scene where Micki fills him on the fire that resulted in the deaths of the stablehand, Matt Harmon, and prized racehorse Texas Nightshade. The partners go over to where James is talking to Mr. Manchester, the owner of the stable. Back at the station, Micki intercepts Walker as they need to take the test together. She worries he isn’t up to taking the test but he jokes that he’s just a bit testy. Connie gives them a message from Hutchinson that says he’s out of the country, which the Rangers think is suspicious. Cordell passes his target shooting with expert marks as does Micki.
Micki visits the veterinarian for the autopsy report on Texas Nightshade, but Dr. Jamison reveals that the horse that died in the fire wasn’t Texas Nightshade but a workhorse. The real Nightshade had a fractured hind leg, but he reported to Walker already. At the office, Walker eats Queso as he reads over the case files. He thinks someone staged the fire to fake Nightshade’s death, with her adding that he wasn’t going to win anyway due to his injury. To save face and insurance money, Mr. Manchester could have had him killed. Micki remembers that Walker isn’t supposed to be on this case, but he confides that this is the only place he fits anymore and asks her to let him help as an unofficial consultant. He plans to pass the recertification by having a sugar cube on him. In the meantime, the stable hand that died had a good family, fiancé, and had no reason to set the fire. They need to find the racehorse to prove foul play.
Walker tells Micki that Manchester’s private jet is about to take off and a horse is wandering around downtown. They decide that Micki and James will catch Manchester before he can flee, while Walker goes to catch a horse. He tracks Texas Nightshade through the park, into the woods, across a river, and eventually finds him by a bush. He gives the horse a sugar cube and puts the harness on him. Across town, Micki and James pursue Manchester on his private airstrip and they exchange fire with the Rangers tire being shot. Cordell rides up on Texas Nightshade and James shouts that he’s certified, as Walker grabs Micki and pulls her onto the horse so they can pursue the criminals. She dismounts into the car and apprehends them.
The trio goes to Side Step to celebrate Cordell’s recertification. The jockey, Jed, confessed as he was in on it with Manchester, but couldn’t go through with it as he loved Nightshade too much. He freed the horse but thought it was a crime to give up on a thoroughbred. As they celebrate their win, Liam approaches and informs Walker that he missed lunch which he apologizes for. Liam brushes it off as Stella didn’t show up for her soccer game so now he can figure it out from there. Walker asks Micki to help him tie up a loose end.
Stella is at their old house with Bel, who thinks they should have just gone to the game and accuses Stella of using the party as a distraction for herself. Walker and Micki pull up so Bel leaves. Micki goes inside to close down the party while Walker reprimands Stella.
Trey makes dinner for Micki who apologizes for not telling him how happy she is to have him around now. She’s scared that she won’t get her job or this right, though she wants to get their relationship right. He does too and tells her that he’s not going to re-up as he wants to figure out what’s next. She inspired him to make a change which she finds cheesy.
In Bobble Head, Walker puts a bobblehead on the dash of Micki’s new truck. He approves of the new vehicle which she is deeply confused by. He repeats Emily’s statement that the bobblehead is for good luck - always smiling, never judging. She is unconvinced but he asks if she’s tried her new features yet, but she hasn’t had time with the stakeout. It’s her first one as a Ranger, which he thinks is a big moment for them. He wants to use the time to get to know one another, but she would prefer to focus on the job. He reminds Micki that they’re only there to watch Toretto not arrest her. He tries to guess her middle-name but she deflects to ask about Stella, to which he claims they’re in a good place. He wants to live in their good place a little longer, but she reminds him that no one can live in a good place forever. When they go inside to find Toretto, they emerge to find that someone stole Micki's truck.
At the police station, James gives the Rangers a run-down of Terreto’s operation. They lost eyes on her earlier that morning but she’ll be in town for another 36 hours before she picks up the weapons. They don’t have much intel on Terreto but are aware of one known associate, showing a video of a male stripper doing a victory kick moments before stealing Micki’s truck. He asks if Micki and Cordell know the make and model of the car Terreto and the stripper stole, to which Micki admits that it was her truck. The Rangers and officers around them snicker but Cordell takes responsibility for the incident. James instructs them to find Terreto, Micki’s truck, and find out who the naked cowboy is.
Micki follows a LoJack operator’s directions to her truck, which is parked outside the Walker ranch. She isn’t able to reach Cordell. Inside, Hoyt and Liam give Stella conflicting tips on how to handle her court date. Cordell tires of the conflict, but Stella thinks they’re being helpful. Cordell notes that nobody benefits from the easy route, recalling Micki’s advice from earlier. Abeline emerges with a platter of hot peppers for the Annual Moy Caliente Competition. Everyone points to Hoyt to go first.
Micki finds her truck and walks towards it when she sees the Walker family inside laughing and chattering. Bonham cocks his rifle behind Micki and asks why she’s here. She explains about her stolen truck, which he knows it’s courtesy of Hoyt Rawlins. He introduces himself and shakes hands with her, inviting her to join him in the bunkhouse. She can’t arrest Hoyt as there isn’t enough evidence, so Bonham invites her inside for bourbon and steak. They sit inside the bunkhouse where he explains Hoyt’s story. He played football with Cordell, had a rough life, but Abeline can’t give up on a stray. He’s more of the “wild horses can’t be broken” type. She thanks him for the company and makes plans to pick up her rental car in the morning. He advises her against arresting Hoyt tonight but it’s just a matter of time before she can catch him. Cordell has a blind spot for past faces, but Bonham subtly encourages Micki to change that.
Micki visits Captain James to ask for his help as one of Walker’s friends is involved in the investigation. James figured out that it was Hoyt Rawlins based on the profile of the theft and eventual return. They can’t pin anything on Hoyt and instructs Micki to keep an eye on Walker, Terreto, and Hoyt. He figures that Walker is hanging out with Hoyt, gathering intel, convincing himself he isn’t crossing the line. He suggests that Micki convince him otherwise. He then tells her about a delivery truck that was stolen last night that he believes is linked to Terreto. He gives the manifest to Micki, who realizes that the delivery truck was stolen at four-am and her truck theft was merely Hoyt’s audition. James takes a call from Walker, listens to his rambling, reminds him it’s “Captain James”, then hangs up. He tells Micki that Walker won’t be in today as he’s gathering intel from a CI. He suggests she go to the Side Step for surveillance.
Micki walks into Side Step under the guise of checking Cordell. He introduces Micki to everyone, though she is annoyed by Hoyt, and dumps a vial of gold glitter on his arm which she found in her truck. He offers to buy her a drink on his tab. She accepts but then arrests him for bribing a police officer, though Cordell protests. Micki claims she’s checking his blind spot and reminding him there is a line.
In the office, Cordell protests that they can’t prove Hoyt is working with Terreto. She gives him the truck manifest for Wagyu beef, which is what the Walker’s had for dinner last night. She points out that he wants to be everyone’s friend even when they do something wrong. She’s holding him for 24-hours until she can find out when and where Terreto is getting the guns. She enters the interrogation room and asks Hoyt where he was to which he admits to being at a strip club. She reminds him that if she holds him for 24-hours he’ll miss the drop, but he doesn’t want to screw over Terreto. She produces a map and explains that they know Terreto is using a butcher truck company as a cover, but they have eight spots that Terreto could be using to pick up the guns. She just needs him to point out which one the drop is happening at then he’ll be free to go. He silently points to a location on the map. He then notes that Cordell got a partner upgrade.
The Rangers and police prepare to breach the warehouse, but no one has eyes on Terreto. Cordell doesn’t think this is right and believes that Hoyt played them. James instructs Micki and Cordell to take a closer look. When they breach the building all that remains inside is Emily’s red mustang and note on the windshield. Cordell tells James that they don’t have anything. Micki reads the note addressed to “‘’Team Sassy Boots’’”, much to Cordell’s grave annoyance. Hoyt tripped off Terreto and they used a different pickup site. Cordell pieces together that Hoyt used a storage facility, remembering that the red mustang used to be in it. He and Micki leave the building.
Terreto’s crew loads the weapons as the police speed up to the building. The crew grab machine guns and point at the Rangers, while James announces their station and demands they drop the weapons. A shootout begins as Cordell and Micki fire back at the crew, while Hoyt dives under a truck to avoid the fire. One by one the crew members fall until the Rangers are able to move in, making numerous arrests, including Terreto’s. Hoyt climbs into Micki’s truck with a bag and steals her keys, speeding off. Micki and Cordell exchange a look and casually walkout. The truck shuts down much to Hoyt’s exasperation. Micki lowers her phone which has the safety feature installed, pleased with the events. Hoyt climbs out of the truck and is arrested by the agents. Micki knows this is hard but it could be worse. He asks about her friend Garrison but Micki tells him that Garrison didn’t make it as he never got the tough love he needed. She assures Cordell that Hoyt is better off where he’s going. It might not be easy, but it’s the right thing to do. Cordell agrees and realizes that he isn’t the only one who needs tough love.
Geri pours a beer from an empty tap, so she calls Lewis to tap another one. Micki enters and asks for a shot of tequila. She gives her a twenty and the ring that Hoyt made. She explains that he left it for Geri before he left town. She apologizes for arresting hot but she was just doing her job. As she walks away, Geri asks if she wants change or another shot. Micki doesn’t want to drink alone so Geri pours a shot for herself. The women down their shots before Geri tells her the price is $45, smirking as she states she’s just doing her job.
In Don't Fence Me In, Micki and Walker drive down the road in her truck. He asks how Trey is settling in, to which she replies fine. He brings up her middle name again as he never knows when a minor detail could help them. They receive an urgent radio call from Connie, who directs them to the Harlan Oil Field where the Sheriff needs backup. She explains that Sheriff Shaw received a distress call from the owner of the field, Bob Harlan, but when he arrived Bob was DOA with the shooter fleeing the scene. Connie describes the shooter as a Hispanic male in a yellow truck. The partners hurry to the field and pursue the suspect. Walker tells the driver to pull over but he swerves instead. Walker tells Micki to bulldog the truck as it’s heading for a flare that will trigger an explosion and kill everyone. She does so by swerving in front of the truck causing it to crash into a ditch. With the driver now unconscious, Micki examines a tattoo on his forearm that reveals him as a gang member.
A press conference is held the next day for Sheriff Monty Shaw to celebrate the apprehension of the gang member, Enzo. Captain James and Micki talk about the oddity of the gang members being involved in the oil field as it isn’t usually their style. He ushers her to the stage where James praises her for her involvement in apprehending the suspect. Micki asks about a woman staring at them, who James explains is the perp's daughter, Delia. As she leaves the stage, Delia angrily tells Micki to do her homework, as her father would never be involved in gang life again. She shames Micki for becoming a cop and betraying her people.
At Side Step, Sheriff Monty Shaw and the Rangers gather to celebrate. Monty loudly tells stories as Micki and Walker watch. She can’t stop thinking about Enzo, as his daughter’s words seemed genuine. Walker assures her that she’s just doing her job. Everyone toasts to Monty before Walker introduces Micki to Stan Morrison, a businessman and co-chair of the Department of Public Safety Admissions. He approves the new Ranger hires. He wishes her luck with her partnership too Walker. Walker gets more drinks at the bar. On his way back to Micki, a man takes the drink as he claims that she likes bourbon instead. He introduces himself as Winston, an APD officer. Micki and Winston used to be partners, and when she arrives they share witty banter with Winston assuring Walker that Micki will open up eventually. Walker rebuttals Micki’s comment of not knowing her by saying he has tried but she won’t tell him anything. Micki strolls away and Sheriff Monty Shaw wraps his arm around her which she shrugs off. He assures her that the gang members won’t be bothering Micki. Cordell intervenes to tell him that Micki can handle herself. When Monty leaves, Cordell gives her a glass of bourbon and remarks that he’s learning.
Trey tries to get Micki to take a break but she is still struggling with the photo op. She feels like the token Mexican good guy used to take down the Mexican bad guy. He sympathizes with her but reminds her that a little girl might be inspired by her to become a cop. Micki explains her crime scene board to Trey, which he is supportive of. He has an interview for a new job lined up but she is distracted. She checks the database to see that Enzo’s gang activity dropped off in the ’90s but she isn’t sure if she should bring up the inconsistency as Monty is a legend. Trey assures her to take her shot. He then sees her sketchbook filled with superhero comics. Cordell puts his box on the shelf only to find love letters addressed to Abeline from a man named Gary.
The next day at the station, Micki fills Walker in on her theories on Enzo’s case. She notices his distraction but still asks him to keep things off-the-books as James isn’t thrilled about their investigation. He is surprised but agrees, also telling her his middle name but she refuses to tell him hers. Connie tells them that Enzo died an hour ago from his injuries.
Meanwhile, Micki and Walker visit Enzo’s daughter Delia who isn’t happy with them arresting her father. She believes it’s because he was Mexican but Micki just wants to understand why he would go back to the Olvidados. Delia explains that the tattoo on his forearm of the teardrops was filled in, meaning he left that life for good. She’s in pre-med school with Cordell pointing out that Bob Harlan attended Delia’s Quinceañera despite his wife hating her. They go to Harlan's home which has security cameras. She was at the Garden Gala waiting for Bob, though Enzo called to tell him the rig was out. She tells the Ranges that Enzo needed a raise which Bob refused. The only reason she didn’t socialize with Enzo was that the children didn’t like him. The partners talk to Harlan's daughter who tells them that Enzo used to look at her for too long and his presence annoyed her. She was busy the night her father died as she was at a party. The son accuses Enzo of hanging around too much and gives his alibi of a private jet. The lawyer reads the will where Bob leaves the entire estate to Enzo instead of his family. Instead, his assets should revert to his wife once the Rangers end their investigation. Cordell notes that they are on the books now.
Trey visits Micki with a towel around his neck. He gives her the comic he found that Micki drew and is impressed by her talent. He has a job interview that afternoon. Her case isn’t going well but she suddenly has a breakthrough and leaves. Micki suddenly appears at Side Step to give Walker the sketches she made of Enzo and Bob, as she saw their resemblance and thinks Enzo could be Bob’s son. Liam interrupts to introduce himself and the conversation turns to the quickness of Enzo’s arrest. Liam likens it to Carlos Mendoza’s arrest only two-days after Emily’s death, then quickly apologizes to Cordell for bringing it up. He claims it’s fine, so she and Micki realize that Enzo might have been framed by one of the Harlan’s.
Cordell and Micki visit Mrs. Harlan about her alibi for the night Enzo died. He tells her about Enzo being Bob’s son which she didn’t know, though Bob only recently adjusted his will. She doesn’t know why he adjusted though Cordell mentions that she never left the Gala. She offers to have Theresa, her daughter, give them the recording of the gala. Cordell tells her that the autopsy results aren’t in yet. As they leave, Walker asks if they can stop by the stable where Stella is volunteering. He casually drops Micki’s middle name which he only learned through the database. He thinks they should trust each other but she tells him that of the 164 rangers, which are mainly white men, she is the only Latina. She has her guard up because she can’t afford to lose this job, as it took her APD partners eight years to get to know her but gives him hope that he’ll get there.
At the station, Cordell tells James that they aren’t sure Enzo killed Bob Harlan. Micki tells them that the seating chart gives her as sitting alone, not with Bob. Cordell asks Connie to access the plant cam at the Harlan botanical gardens, which she does with ease due to her hacking abilities. The camera feed catches Mrs. Harlan and Monty Shaw, with Micki wondering if they conspired to kill Enzo. James reluctantly agrees to let them talk to the Sheriff.
The Rangers visit Monty who is on his way out, so Micki offers to ride with him while Walker follows. Monty agrees which annoys Walker but he follows anyway. He calls Micki who puts him on speaker so he can hear their conversation. She asks him questions and reveals that Enzo was bludgeoned and the gunpowder residue matches Monty’s. Walker asks Connie to patch James into the feed. Micki tells Monty her suspicions of him being a dirty copy who had an innocent man framed, causing him to become enraged, Micki puts Cordell on the car's speaker system so Walker can tell Monty to pull over. Instead, Monty pulls a gun on her which she shouts for Walker to bulldog the car. With Monty’s car stopped, Micki handcuffs him to the wheel and exit the car. She thanks him for the save and he assures her that he has her back. At the station, the Rangers and James celebrate Micki’s win with him approving of her antics. He also assures Micki that what happened to Enzo wasn’t her fault, as the autopsy confirmed that Monty shot Enzo who tried to defend himself when Monty hit him in the head with his gun. He was merely spooked by the Rangers vehicle but the head trauma was already suffered. Walker chimes in that Harlan’s estate goes to Delia, Enzo’s daughter instead. James gives them barbeque from Micki’s favorite place, per Walker’s intel which he has a lot of thanks to Trey. She thanks him for believing her about the case not feeling right, which he admits that he didn’t believe her but trusted her
Micki returns home to find Trey shirtless in the towel-cape. She hugs him which he claims is part of his superpowers. She assures him everything is fine and is grateful for his help with the case. She asks about his interview for the position, Director of Sports Medicine and Assistant soccer coach at Sacred Heart High. She is thrilled for him and asks for all the details. He gives her a present, which is a framed image of her comic book sketch.
Micki is a strong-willed, intellectual, and by-the-book woman with a strong moral code. She believes in following the rules and doesn't agree with Cordell's "edge of the coin" mentality. As a Latinx woman, Micki knows what it feels like to be discriminated against and was drawn to law enforcement so she could make a change. She is a private person who doesn't indulge much about her personal life, despite Cordell's persistent attempts to get her to open up. She tires of Cordell's rambling and antics quickly, often checking him about the severity of various situations. She can be quite wise in her advice to Cordell, despite her bluntness. In her personal life, Micki maintains a sense of duty to her job but is deeply loyal to her boyfriend, Trey Barnett, though she worries about balancing her two worlds.
- This character was created originally for the reboot, though she can be compared to James Trivette from the original series.
- She likes blueberry ice cream, green tea, barbeque, and bourbon.
- Micki is a talented sketch artist and draws comic book characters in her spare time.
- Micki (to Adriana after learning she was adopted): "I always asked myself why couldn't I make my mom proud, and you let me feel that way. You never had that right."
- -- Tracks