A prison transfer goes awry and Walt urgently pursues a serial killer and his fellow escapees, who have taken hostages, up a mountain. Facing an impending storm with very limited resources, Walt’s mettle is put to the test and hypothermic hallucinations force him to face his past.
When a body is found in a compost heap, the victim's history of abusive behavior leads to a varied list of suspects. Walt and the team must cross county lines to track down the killer. Branch looks into Cady's abrupt departure from Absaroka.
Walt and the team explore Absaroka's Basque community when a shepherd and his dog are found dead. Branch walks a thin line in his alliance with Jacob Nighthorse. Meanwhile, Cady looks to Detective Fales for answers about her mother's death.
A cattle heist sends the team on an urgent search for the missing livestock and driver as well as the thieves. Walt is concerned by Vic's fearful behavior when she receives a mysterious bouquet of flowers.
When a teenage girl is found dead, Walt and the team investigate ties to the illegal sale of prescription drugs. Meanwhile Henry reconnects with an old flame and Cady returns home.
Walt is tipped off to the murder of a supposed psychic by the Contrary Warrior, a Cheyenne who does the opposite of what people expect. While deciphering his backwards clues, Walt must also deal with a public debate against Branch.
After Henry overhears a disgruntled husband try to order a hit on his wife, Walt and the team must use what little information they have to prevent her murder. Vic is wary when an ex-cop from Philly shows up in Durant.
When a wild horse is found dragging a dead body, Walt discovers evidence of an illegal rodeo at a local farm. Detective Fales comes to town to talk to Henry.
Following an explosion on the reservation and the discovery of a charred dead body, Walt is bombarded with public confrontation as the Cheyennes blame the blast on gas leaked from fracking by Newett Energy. Meanwhile, Branch reconnects with Cady and uncovers information that could help him in the election.
On election day, Walt and Branch aren't thinking about politics when Cady is badly injured by a hit-and-run driver. Vic and Ferg investigate, and Walt has a flashback to when Cady was a little girl.
When a game warden is killed alongside an elk that was poached, Walt discovers a connection to a rare expensive supplement. Walt completes his sacrifice, and Branch closes in on the truth about Cady's accident.
Longmire investigates after he receives a safe deposit box from a just-murdered inmate that contains a severed finger that is linked to both a new murder and a 20-year-old armed robbery. At the same time, Vic's paranoia peaks when she suspects she is being stalked, forcing her to confide in Walt.
Walt and Branch team up when an apparent suicide is connected to Cady's accident. Meanwhile, Detective Fales returns with warrants, forcing Walt and Henry to face what happened in Denver.
A bank robbery ends in a shooting, giving Sawyer more leverage against Walt. When Henry goes missing, Cady tells Walt about a disturbing vision.
While Henry recuperates, Walt investigates the murder of a man whose land is popular with treasure hunters.
Chance Gilbert's plea appearance takes a dramatic turn that pulls Walt away from his own case and sets him and Vic on the path to a showdown.
An emotional Vic re-examines her life choices. Henry and Jacob join forces to pursue Malachi. Ferg helps Meg's mother avoid the tribal police.
As the civil trial begins, things don't look good for Walt -- especially after a murder puts him and Vic under suspicion.
The bizarre death of a drug dealer points to a violent new Hector. Cady tries to help a sick child whose parents don’t trust Western medicine.
Walt wonders if a presumed-dead member of the Irish mob is alive. Mathias questions Cady about Catori. A mobile clinic raises Henry's suspicions.
While Ferg secretly works the Cowboy Bill case, Walt and Vic try to find Shane Muldoon. Cady's office is trashed.
Vic gets a surprise visit from her father. An FBI agent helps Walt pin down the mole working with Malachi. A tough race enables Vic to move forward.
Walt deals with the aftermath of Henry's arrest and Branch's shooting.The search for the shooter, however, is complicated by Branch's insistence that it was someone known to be already dead.
An investigation into the murder of a Russian adoptee leads the team into a shady underworld; Henry faces trouble behind bars while Cady attempts to secure him competent legal representation.
Walt splits his time working on a murder investigation and serving as a judge for a local pageant; Cady hopes an old friend can help with Henry's case.
Walt and the team track missing teenage campers on a leadership trip in the wilderness; Branch continues his unauthorized search for his shooter.
Walt teams up with Lucian Connally to narrow the field of suspects in his wife's murder. Branch's behavior causes problems.
A media frenzy erupts when a long-lost heir who went missing 30 years earlier is found dead. Henry makes a risky decision on his own.
Vic's vacation turns deadly after she and Sean are kidnapped following an accident. Walt is forced to make an unusual alliance to rescue the pair.
A life insurance policy complicates the investigation into a farmer's apparent murder. Branch and Cady check out a lead in Denver. Vic receives an ultimatum from Sean.
Walt is seriously concerned by Branch's behavior, but makes a key discovery in the David Ridges case. Henry faces a major setback in his trial. Vic makes an important decision about her future.
Walt seeks closure in his wife's murder and Henry's case; Branch is suspended but continues to investigate Jacob Nighthorse.
Struggling since his wife’s death and at the urging of his daughter, Longmire knows that the time has come to turn his life around. With the help of a female deputy new to the department, he becomes reinvigorated about his job and committed to running for re-election. When an ambitious young deputy decides to run against him for sheriff, Longmire feels betrayed but remains steadfast in his dedication to the community.
Longmire and his team investigate the death of an exotic dancer with possible Amish roots. Cady's new relationship stirs up controversy.
Longmire uncovers long-buried family secrets when he probes the deaths of a man and his award-winning horses in a barn fire.
A fisherman discovers the bodies of two murder victims, including a teen from the Cheyenne reservation.
Walt and the team look into the disappearances of several Cheyenne foster children and an unregistered sex offender.
Walt suspects a bear was baited to fatally attack a released murderer. Branch's retired uncle, a former sheriff, can't resist the lure of law enforcement.
A wealthy beer distributor is brutally assaulted for a seemingly worthless painting; Vic's husband is jealous of her relationship with Walt; Branch's father uncovers information damaging to Walt's campaign.
Henry uses his tracking abilities to locate an unstable young woman who may be involved in the murder of a gas-station owner.
The Tribal Council president is found dead on county land but it s clear he died elsewhere and there is soon a large suspect list. Walt deals with feelings of betrayal when he uncovers Cady and Branch s affair.
In the first-season finale, a teen is murdered after being acquitted of raping a Cheyenne girl. Later, Walt is forced to finally confront his wife’s death.