Jody Mills is the sheriff of Sioux Falls, South Dakota. She is an ally of the Winchesters, and occasionally helps them in their cases. She was also affiliated with Bobby Singer before his death. She was also the wife of Sean Mills and mother of Owen Mills until their deaths, and has since adopted Annie Jones and Claire Novak.
Jody was a resident of Sioux Falls. She was eventually promoted to the rank of Sheriff. Either before or after this, Jody met and married a man named Sean, and together they had a son named Owen. Owen died of unknown causes when he was just a boy, leaving Jody devastated.
At some point, Jody developed a history with Bobby Singer, whom she typically regarded as a troublemaker and a drunk before the events of the series.
She first appears in Dead Men Don't Wear Plaid when she walks into the diner and sees two men talking to "Digger". She asks Sam and Dean who they are, and they reply FBI. When they give her their "supervisor's" number, she finds out it's in fact Bobby Singer by recognizing his voice. She warns Sam and Dean to stop whatever it is they're planning to do.
She later arrests Sam and Dean when they go after a man who had come back from the dead. Bobby later comes by and talks her into releasing Sam and Dean. It is later revealed that her own son had come back, which is the reason she is not taking action on this matter.Then her son starts to get sick and she is very worried. But when she walks back into the room, she finds her husband dead, and her son eating him. As she backs away, Sam comes in and saves her. He gets her out, and she tries to go back and save her husband, but Sam tells her that her husband is already dead. Sam goes in and shoots her son. Afterwards, she teams up with Sam and gets the town ready for the zombie attack. She and Sam later arrive to save Bobby and Dean. After the attack, she and Dean sweep the area for any remaining zombies. Weekend At Bobby's, when she and an FBI agent arrive at Bobby's door. She helps Bobby by getting the agent outside his house, but is shocked to hear that he also had a body outside as well as inside. They go outside to find a hole, and she gets rid of the agent. Bobby later asks her a favor to get Rufus moved to jail in town. Jody is shocked by this request and tells Bobby she could lose her job and drives away. She later comes to Bobby's doorstep with Rufus, and tells Bobby he has a certain amount of time before she calls in and tells the FBI Rufus escaped from her custody. She threatens that if she loses her job over this, Bobby will be in trouble. Hello, Cruel World Jody was at the hospital the Leviathans decided to use as their feeding area. She recently had surgery and was sharing a room with another woman. In the night, Jody witnesses the woman being taken away by Dr. Gaines who treated her. She follows him to see Dr. Gaines kill and eat the woman. Escaping back to her room, Jody soon passes out in the hallway, and wakes up back in her room with Dr. Gaines telling her he'll see her soon. With her life in danger, she calls Bobby Singer for help. Bobby gets her out of the hospital and checks it out.
In Slash Fiction, Jody manages to find Bobby in his hideout. She offers him food and beer. Jody thanks Bobby for saving her and offers to cook for him. It's thanks to Jody that Bobby figures out the Leviathans' weakness. Jody was cleaning the place using a cleaning agent that contained Borax, a chemical which painfully dissolves the skin of Leviathans, and Bobby kisses her for it. As she leaves, Bobby gives her the Leviathan's head and tells her to toss it into the river.
In Time After Time she calls Sam up with a case of people being mummified. When she calls a second time she finds out that Dean has gone missing, and offers her help. Sam asks her to go to Bobby's storage to grab some boxes. She arrives at the condemned house Sam is staying at and brings in the boxes of supernatural research. Jody and Sam look over the case and from the ring on the man's finger they figure out it's the Time God Chronos. So they look for a way to summon Chronos. Eventually, they find the ritual required to summon Chronos from any point in time, but Sam states that they first need to know the right time when Chronos has his hands on Dean to bring him back.
Jody later sends Sam to bed when he tires himself out, but he later comes and shows her a letter from Dean, revealing he had traveled back to 1944 and was working with Eliot Ness to find Chronos, whom they discovered was romancing a woman named Lila Taylor. Sam and Jody visit an elderly Lila and obtain the date and time to summon Chronos. They return to the house and perform the summoning ritual, bringing both Chronos and Dean to the present day. Jody goes to help Dean, whom Chronos has turned his murderous eyes on, blaming him for ruining his happiness. Sam stabs Chronos with an olive stake, killing the god and saving Dean.
After Sam and Dean Winchester rescue the virgin blood "donor" Emily from one of the Alpha Vampire's house, Sam gives her a phone with Jody's number, and tells Emily to call her for help if they are not back by dawn. Emily, however, had been brainwashed into thinking the Alpha Vampire was her father, and threw Jody's number in the fireplace before returning to her "father".
In Sacrifice, Jody goes on a date with what she believes to be a man named Roderick, but it is actually Crowley. The two get along great and Crowley claims to have lost loved ones, causing Jody to remember her dead son and husband and cry.
She goes into the bathroom to calm down, but Crowley casts a spell that causes to her to start choking to death on her own blood. Sam and Dean call him to stop, but tells them that he will spare Jody's life only if they stop the trials to close the Gates of Hell and turn over the demon tablet, using the short time Jody has left to press the issue. Dean agrees if he swaps the angel tablet instead and Crowley tells them they must say "I surrender" before he stops. Presumably Sam and Dean do and Jody is saved.
In Rock and a Hard Place, Jody is called to the town of Hartford, South Dakota which she covers as Sheriff along with Sioux Falls and after learning of the fourth mysterious disappearance where unnatural strength was displayed, calls in Sam and Dean to investigate. Jody tells them about the case and brings in the only witness who describes a strange blue light after the truck the victim was hiding under was pushed over. Later, after Dean goes with Suzy Lee to her apartment, Jody works with Sam on the case, figuring out that the people were virgins who broke their chastity promise. When Dean doesn't answer the phone, Sam and Jody rush to Suzy's apartment to discover it a mess and the two gone.
Searching for who could have done this, Jody finds out about the Roman goddess Vesta who has fire powers and buries alive virgins who don't stay virgins. Sam gets a call from Dean and though he loses the signal, he and Jody are able to figure out where he is because of a train passing in the background. Jody discovers that Vesta can only be killed by an oak stake stained in the blood of a virgin and they head to the town church where the two try to convince a virgin to give them her blood. When she refuses, Jody punches her in the nose and wipes some of the blood off on a tissue. Carrying the stake, Jody and Sam search the farm they believe Dean is at and locate an old bomb shelter in the barn where Dean is. Vesta attacks, knocking out Sam and threatening Jody who surprises her by revealing her knowledge of Vesta's nature. As Vesta is distracted tying her down and telling her why she is doing this, Jody tries to stab her with the stake, but Vesta overpowers her and tries to kill her with it. Though Sam manages to stop her from being killed, Jody is stabbed non-fatally. While Vesta is distracted by Sam, Jody stabs her from behind with the stake, killing her. Dean then manages to open the door of the shelter and the three rescue the three surviving victims. Jody, her arm in a sling, thanks Sam and Dean for their help before saying goodbye.
In Alex Annie Alexis Ann, Jody returns to her police station to find a vampire named Cody attacking a young woman in one of the jail's cells. Acting quickly, Jody decapitates Cody with a fire ax and calls in Sam and Dean to help as she overheard Cody mentioning that more vampires would be coming after the girl. Sam and Dean confirm that she is not a vampire while Jody finds out she is Annie Jones, a girl who was kidnapped eight years before and has no surviving relatives, however, she insists that she be called Alex. While Sam and Dean hunt the nest, Jody takes Alex to her family cabin to protect her. There, Alex acts rude even when deducing that Jody's family is dead, but Jody does her best to take care of her. That night, Sam and Dean call her to warn her that the vampires are coming and that there's a problem with Alex, but they arrive during the call and Jody is knocked out in the fight that follows.
When Sam and Dean arrive the next morning, they tell Jody that they have learned that the vampires are using Alex to lure in humans to feed on and that they plan to raid the nest and kill all the vampires inside with the rescue of Alex being a secondary priority. Despite their reservations, Jody demands to come with them and refuses to be left behind. At the nest, Jody searches the basement after hearing Alex scream and finds her turned into a vampire. Jody is captured by the vampire "mother" Celia who tries to get Alex to feed on Jody to complete her transformation.
Alex refuses as Jody was so good to her and Jody realizes that Celia lost a daughter named Alex and kidnapped Annie Jones and renamed her Alex to replace her dead daughter. Celia admits this while Jody admits that she's been trying to fill the void in her life created by the death of her family with many things, including Alex. Celia tries to drain Jody of her blood and kill her, but Alex saves Jody by injecting Celia with dead man's blood, incapacitating her. Telling Alex not to look, Jody retrieves her weapon and decapitates Celia as Sam and Dean come to help, having finally dispatched the other vampires. As Alex didn't feed, Sam and Dean are able to use Celia's blood to create the vampire cure and cure her. Jody takes Alex back to her cabin where she tells Sam and Dean she intends to look after her and that they were right about her trying to fill the void in her life. After they leave, Jody goes to Alex who is going to be sick for a few days from the cure and promises to be there for her, understanding what it's like to lose one's whole family.
In Hibbing 911, Jody is forced to attend an officer's retreat in Hibbing. Here she meets Officer Donna Hanscum and is paired as her partner due to being on the phone with her adopted daughter Annie Jones, thus being unable to freely select a partner. Jody overhears a conversation about an animal attack. Deciding to take matters into her own hands, she heads down to the morgue, but is denied access to the victim's body until Donna arrives. The two continue with their retreat until Sam and Dean arrive to help with the case. After Jody and Donna have a dispute over their ex-husbands, Donna heads outside for some fresh air. There she witnesses Sheriff Len Cuse with his vampire teeth exposed standing over a deceased Sheriff Goodhill. She explains what she saw to Jody, who takes the new information and breaks into Sheriff Cuse's room. There Jody, Donna, Sam, and Dean find an address that leads to a barn. At the barn, the four of them are captured and discover that Sheriff Cuse left his life as a vampire much to the annoyance of Starr and her nest. Sheriff Cuse is then executed by Starr while Dean and Donna break free and dispose of the rest of the vampires. Jody helps Donna come to terms with what has happened and has agreed to fill her in on how to kill a variety of other monsters.
Jody is shown taking care of Alex and Claire in Don't You Forget About Me Like Alex, Jody does not believe that Claire is hunting real monsters, and is in fact just causing trouble. Since Jody is the Sheriff, Claire has yet to be arrested. When the Winchesters arrive, Jody tells the boys over the table how she thinks Claire is doing. When Claire points out that Alex is planning to run off to have sex with Henry in Jody's cabin, Jody admits she saw birth control pills in Alex's bag.
Awkwardly, Jody tries to give Alex a sex-talk, and is unhappy that Sam and Dean don't agree with her much.
When Sam and Dean go looking into suspicious deaths, Jody and Claire are captured by the janitor at Alex's school, who turns out to be a vampire. Jody and Claire are tied up while the vampire Richard Beesome and Henry, who is also a vampire, taunt Alex, whom they've also captured.
The Winchesters then come to their aid. With Claire's help, the brothers are able to defeat the two vampires and save Jody and Alex. Jody is badly injured but well enough to bid the brothers farewell.
In Celebrating The Life Of Asa Fox, the Winchesters drop by after a hunt to visit Jody who's enjoying a day off alone while Alex and Claire are at a concert. The three enjoy a movie on Netflix before Jody gets a call that Asa Fox is dead. An emotional Jody explains that Asa had come through town a few months before on a ghoul hunt and since then, they had met up sometimes for coffee.
Joined by the Winchesters, Jody goes to Asa's home in Canada for his wake where she is shocked to learn that Mary Winchester has been resurrected. After noticing Dean struggling with Mary's return, Jody offers him advice as a mother who has lost her husband and son and how she would react if they returned.
When one of the hunters in the house is revealed to have been murdered by the Crossroad Demon Jael, Jody works with the others to try to defend themselves and suddenly accuses Mary of being possessed and tries to get the other hunters to kill her. The Winchesters realize that its actually Jody who's possessed by Jael who reveals himself and throws the hunters around despite their best efforts to fight back. Jael reveals that the hunter Bucky was actually Asa's killer and that Jody, who was in a relationship with Asa, dreamed of a future with him. As Jael throws them around, the hunters perform an exorcism, each taking over after one is incapacitated. Finally, Jael is exorcised from Jody and sent back to Hell. Jody survives the exorcism and tells Sam that it was the worst experience ever.
The next morning, as the bodies are burned, Jody tells Mary mother to mother that Sam and Dean are the best men she knows and Mary should be proud of them. Mary tells Jody that Sam and Dean aren't the problem.
As a law enforcer, Jody is strong, collected, and tough. She is kind, compassionate and can be smoothly sarcastic when she needs to be. She sometimes acts motherly to Sam and Dean, occasionally bossing them around and nearly using her "mother voice" on Sam until he stopped her. She is very protective of her adopted daughters, though she fails somewhat in trusting their judgement and can come off as a little too strict.
- While Jody has gotten involved in several cases with the Winchesters over the years, the ones she gets involved with the most are Vampires and gods. Jody encountered vampires in Alex Annie Alexis Ann, Hibbing 911 and Don't You Forget About Me. The Winchesters also tried to send Emily, a girl they believed rescued from vampires to her in There Will Be Blood. Jody encountered gods in Time After Time and Rock and a Hard Place.
- Jody Mills shares her name with Sheriff Mills from Harper's Island, who was portrayed by Jim Beaver, the actor who portrays Bobby Singer.
- According to Jody, when she first met Asa Fox, he introduced himself as Agent Fox Mulder of the FBI.