Summary: In Harris County, Deputy Russell Gonzales races the clock to track down the killer of an unidentified man found dead in a desolate field on the side of the road. It's an uphill battle for the team until a couple appears on scene and breaks the case wide open. In Miami, Detective Rolando Garcia and his team investigates the murder of an innocent bystander caught in a hail of gunfire. As detectives delve deeper, they discover that the killer's motives may not be what they think.

Summary: In Harris County, Dep. Abraham Alanis and his team investigate the murder of a man, married with four young children, who was found robbed and shot to death outside an abandoned house. With no other leads to go on, investigators discover that their victim held a secret that could lead to his killer.

Summary: In Detroit, Sergeant Matthew Gnatek and Officer Nancy Foster are investigating the murder of a soon-to-be father, found shot to death in a deserted field during a snowstorm. With no witnesses and potential evidence disappearing under the blanketing snow, the Crime Scene Unit works quickly with metal detectors, to uncover an item that will put Gnatek and Foster on the trail to meet three young women who each hold a piece of the homicide puzzle.

Summary: For homicide detectives, the clock starts ticking the moment they are called. Their chance of solving a case is cut in half if they don't get a lead in "The First 48". Each passing hour gives suspects more time to flee, witnesses more time to forget what they saw, and crucial evidence more time to be lost forever. Follow detectives from around the country during these critical hours as they race against time to find the suspect.

Summary: In Miami, Detective Anthony Reyes and the homicide team are investigating the murder of a man found brutally beaten to death below a major interstate. Reyes must navigate through false leads and dead ends, until an eyewitness comes forward and ignites the case. When detectives discover that their eyewitness is leaving out one major detail in his story, the case is turned on its head.

Summary: In Miami, Det. Frank Sanchez responds to the murder of a retired Miami Police captain, shot in broad daylight at a marina on the Miami River. When initial leads run dry, Miami PD launches a massive investigation, tracking the alleged killer all the way to New Jersey.

Summary: In Birmingham, lead Detective Mike Allison is working the murder of a man found shot in the basement stairwell of a house. Allison and his team quickly find an eyewitness and then the suspect. The case seems closed, when suddenly it unravels after the eyewitness disappears and Allison is forced to set his suspect free. A year passes, when out of the blue, the case takes a surprising turn. And in Charlotte, Lead Detective Bo McSwain and his team are trying to find the killers of a man shot behind his girlfriend's house. On scene, McSwain gets a break when four men come forward, claiming their innocence. The team believes these men are their suspects, but when they all refuse to talk, the case hits a wall. With nothing to hold them, the suspects start to leave homicide, but then McSwain makes a discovery at the crime scene, stopping one suspect in his tracks.

Summary: When a man arrested for a domestic dispute claims his boyfriend killed someone seven months earlier and buried the body in the basement, Louisville Detectives Jon Lesher and Collin King are launched into one of the strangest cases of their career. Detectives are initially skeptical of the man's claim, but after hours of digging in a hot, humid basement, they discover the truth: buried five feet below the dirt floor is a large plastic storage box containing human remains. Detectives must now determine if the man accused of the murder is a cold-blooded killer, or if a vindictive lover is out to frame him. And in Charlotte, a 55-year-old father of three is stabbed to death and left for dead in the middle of a residential street. Det. Susan Sarvis and the homicide team initiate a citywide hunt for the last man seen with the victim to find out if he is a witness or if he's responsible for the homicide.

Summary: When fire fighters in Detroit respond to a house fire and discover a 63-year-old woman stabbed and bound, Sergeant Kenny Gardner and Investigator Barbara Simon must investigate the brutal murder. With no witnesses, they have to rely on the local community to help them find her killer. In Charlotte, Detective Phil Rainwater and the homicide team are called out to a restaurant parking lot littered with shell casings, where a 20-year-old father was shot dead. Surveillance video shows their potential suspects fleeing the scene in a white SUV. If they can track down the car, they may find the shooters.

Summary: For homicide detectives, the clock starts ticking the moment they are called. Their chance of solving a case is cut in half if they don’t get a lead in “The First 48″. Each passing hour gives suspects more time to flee, witnesses more time to forget what they saw, and crucial evidence more time to be lost forever. Follow detectives from around the country during these critical hours as they race against time to find the suspect.

Summary: A Louisville celebrity is murdered; and a deadly shootout is investigated in Miami.

Summary: In Charlotte, rookie Detective Norma McKee gets her first double-murder: a young couple shot in their car by a backseat passenger. Inside the vehicle, detectives find what may be a vital clue, a baseball hat that might contain the suspect’s DNA. Meanwhile, seasoned Miami detective, Emiliano Tamayo has two cases in two days. First he responds to a call reporting a foul smell, only to find a family of three found dead in their home; later that night he is called to the scene of a young man killed over a fifty-dollar bet. With four deaths in forty-eight hours, Tamayo calls on his years of experience to solve the cases.

Summary: Miami detectives investigate the murder of a man found floating in Biscayne Bay, and a second homicide that may be connected to the first case.

Summary: Detroit detectives investigate a double homicide; an elderly woman is murdered while taking groceries out of her car in Harris County, Texas.

Summary: In Charlotte, when a store clerk and father of three young children is shot in a robbery by a masked man, lead Detective David Osorio and his team interview witnesses and find that no one knows the shooter. With little to go on, Osorio must find a way to identify his suspect before he can hope to track him down. And in Miami, lead Detective Kevin Ruggiero and his team head to Overtown to investigate the murder of a young father shot in the street. When Ruggiero learns that the victim’s friends are out to retaliate, he must race to find the shooter before there’s another killing.

Summary: In Charlotte, rookie homicide Det. Brian Whitworth is assigned his first case when a woman is discovered on her bedroom floor, stabbed to death. Hampered by false leads and a lack of eyewitnesses, Whitworth must rely on the physical evidence to bring the killer to justice. Meanwhile, in Louisville, Det. Jon Lesher investigates the homicide of a 43-year-old father, gunned down in front of his house for telling a rowdy group of men next door to quiet down. The case comes to a standstill when an eyewitness steadfastly upholds the street's code of silence. Lesher must use his veteran-interview techniques to break the code and get the witness to talk.

Summary: After a year with the gang unit, Detective Kevin Ruggiero returns to Miami Homicide, investigating a drive-by shooting that left two men dead. He has little to work with until he learns that one of the victims was a founder of a local gang. Then in Louisville, Detective Kristen Downs responds to the shooting of a 17-year-old boy. When she learns that his friends witnessed the shooting, she has to convince them to overcome their fear of retaliation in order to bring him justice

Summary: After a year with the gang unit, Detective Kevin Ruggiero returns to Miami Homicide, investigating a drive-by shooting that left two men dead. He has little to work with until he learns that one of the victims was a founder of a local gang. Then in Louisville, Detective Kristen Downs responds to the shooting of a 17-year-old boy. When she learns that his friends witnessed the shooting, she has to convince them to overcome their fear of retaliation in order to bring him justice

Summary: Two men are shot in a motel in Charlotte; and Miami detectives investigate an apparent suicide that they suspect is a murder.

Summary: In a bloody convenience store shooting, Birmingham Detective Chris Anderson needs an old surveillance system and cooperation from the victim's mother to help solve the case. When a Miami shooting follows a brutal public attack, Det. TC Cepero and his team try to piece together the turn of events to determine if the murder was justified.

Summary: In Las Vegas, NV, Detective Jimmy Vaccaro and his team are called out at midnight to an empty desert highway, where a man's been shot dead in the middle of the road. From the victim's cellphone, they quickly get a lead: just minutes before he was killed, he received a call from a friend with whom he worked at a local strip club. But when they track down the co-worker and bring him to the station, the case takes an outrageous turn that exposes the ruthless underside of business in Vegas.

Summary: A bystander is murdered with a brawl turns into a gunfight; a shooting victim's 911 calls may hold the answer to his killer's identity.

Summary: In Birmingham, Detectives Eric Torrence and Henry Lucas investigate the murder of a 31-year-old male found dead in a field. But with a tight-lipped community where street law is paramount, finding someone to talk is the team's biggest challenge. As the clock winds down, will the community pull through and bring the killer to justice? Then, in Charlotte a man is chased down and killed in front of his nine-year-old son. Detective Blair Fitch is shocked to discover the killer was getting even with someone else. The case takes a surprising turn and leads detectives to New York where the suspect turns up in relation to another murder.

Summary: In Miami, ten days before Christmas, a young corrections officer is shot dead with her two-year-old son while sleeping in their bed. Det. Kevin Ruggiero and Sgt. Ervens Ford take the case personally--not only do they consider the victim 24-year-old Ciara Lee as "on our team", but the death of her baby boy hits them emotionally. In this intense manhunt the detectives uncover the intended target, the motive, and the suspected killers, making an arrest two days before Christmas. But a surprise twist at the end leaves them frustrated and determined.

Summary: In Birmingham, a 49-year-old man is beaten and shot in the middle of a housing complex in broad daylight. In a community where no one wants to be seen as "snitching," finding someone to come forward with information will be Detective Chris Anderson's biggest challenge. Then, in DeKalb County, lead detective Chris Franklin investigates the murder of an 18-year-old male, gunned down in an apartment complex. The case takes a turn when Franklin learns the killer's intended target was actually the victim's friend.

Summary: In Miami, the Homicide Unit responds to a scene to find the 911 caller covered in blood and a 35-year-old woman brutally stabbed. And in DeKalb County, Det. Joe Renaud and his team are working the shooting murder of a 22-year-old man.

Summary: A man is found dead in an alley in a Birmingham suburb; A 24-year-old man is shot to death in his apartment in DeKalb County, Ga.

Summary: In Miami, two men are found beaten and shot behind an abandoned house. As Det. TC Cepero digs deeper into the case he unearths more than one reason the men could have been killed.

Summary: A person is killed in Miami while trying to stop a robbery.

Summary: In Birmingham, Lead Det. Henry Lucas and the Birmingham Homicide Team are trying to solve the mystery of how a young man ended up shot in the back in the middle of a scrap yard. With no witnesses, Lucas hopes the victim's friends can lead him to the killer. In DeKalb County, Lead Det. Lynn Shuler and the Major Felony Unit are called to a motel where a woman has been found dead. The case takes a dark turn when the team learns that a man was in the room shortly before the woman died, but had since disappeared.

Summary: Birmingham Detective Warren Cotton investigates the murder of three family members, including a 12-year-old girl, who were stabbed to death in their home and then burned. In Miami, Detective Ricardo John and his team are working the shooting of a young man who has been a witness in several previous homicide investigations.

Summary: In September of 2010, Jessie Dotson went on trial for one of the worst mass murders in Memphis history. He wasn't accused of killing strangers--he was brother, friend and uncle to the six people he'd allegedly murdered and three surviving children he'd allegedly beaten and stabbed. Even seasoned detectives were horrified by the bloody crime scene. Now, all of Memphis wanted an answer to the same question - How could only one man be responsible for such brutal carnage? (2 hours.)

Summary: In Birmingham, a 49-year-old man is beaten and shot in the middle of a housing complex in broad daylight. In a community where no one wants to be seen as "snitching," finding someone to come forward with information will be Detective Chris Anderson's biggest challenge. Then, in DeKalb County, lead detective Chris Franklin investigates the murder of an 18-year-old male, gunned down in an apartment complex. The case takes a turn when Franklin learns the killer's intended target was actually the victim's friend.

Summary: In Miami, lead detective TC Cepero investigates the murder of a 20-year-old male, gunned down in the middle of the street in broad daylight. With surveillance video of the suspect and possible witnesses they learn the victim may have been on the killers hit list. Then, in DeKalb County, a 20-year-old man is shot dead while walking his girlfriend home at night. Sergeant Matthew Ferreira and team must work quickly to solve this senseless murder that also left two others injured.

Summary: In Harris County, a family man is shot down in his driveway. With no motive or witnesses lead investigator Deputy Juan Viramontes hopes a clue found on the victim's car can lead to the killer. And in Miami, as a family settles in for the night, gunshots erupt in their front yard. A startled mother walks outside and discovers her son shot dead. Rookie homicide Det. Frank Castillo must delve into the vices of the victim in order to track down the person responsible for this brazen act of violence.

Summary: In Miami, the Homicide Unit responds to a scene to find the 911 caller covered in blood and a 35-year-old woman brutally stabbed. And in DeKalb County, Det. Joe Renaud and his team are working the shooting murder of a 22-year-old man.

Summary: A man is found dead in an alley in a Birmingham suburb; A 24-year-old man is shot to death in his apartment in DeKalb County, Ga.

Summary: In Harris County, Deputy Abraham Alanis is working the homicide of a 69-year-old Navy veteran. When Alanis' first big break, surveillance video of the potential perpetrator, fails to show the suspect's face, investigators take a closer at the footage and notice something big--a small detail in the video, could be a huge break for the case. And in Birmingham, Det. Marcel Walker responds to the city's first homicide since a deadly tornado ravaged the city. Walker needs to determine whether two people seen fleeing the crime scene moments after the shooting are witnesses to the heinous act or responsible for it.

Summary: In Harris County, Deputy Jason Brown is called out on Easter Sunday to investigate the brutal shooting of a woman who was a school bus driver and mother of two. Meanwhile, Harris County Sergeant Sidney Miller takes on the murder of a young father, shot dead in a courtyard.

Summary: Harris County/Harris County - Dep. Jason Brown is called out on Easter Sunday to investigate the brutal shooting of a woman who was a school bus driver and mother of two. Meanwhile, Sgt. Sidney Miller takes on the murder of a young father, shot dead in a courtyard.

Summary: When a robbery goes bad in south Memphis, one man is dead and very little physical evidence is left at the scene. Detectives track down several witnesses, but the one person who saw the shooting was a 10-year-old boy. Fast forward five years to a dramatic murder trial. The witness is now 15 and well aware of the dangers of testifying. Will he do the right thing? Or not...

Summary: In Birmingham, Detective Chris Anderson investigates the gruesome murder of a woman who is shot to death and then set on fire. Anderson hunts down his suspects, but it's the victim's family that reveals a final, disturbing twist in the case. In DeKalb County, Detective Joe Renaud is working the homicide of a father of four, gunned down outside an apartment complex on the east side of town. Without little to go on, Renaud and his team must put the pieces of this puzzle together to track down the killer.

Summary: In Miami, Detectives Anthony Reyes and Manny Castillo investigate a man shot dead on a residential street. The case takes a turn when they learn that the house he was found in front of is where his ex-girlfriend lives. Then in Birmingham, a gunfight at a gas station leaves one man dead. Detective Cynthia Morrow discovers surveillance video that shows who killed the man, but eyewitness testimony calls in to question who is to blame.

Summary: A Louisville, Kentucky family awakes before dawn as a barrage of gunfire rips through their home. When the smoke clears, three teenage boys are bleeding from bullet wounds. One would not survive. The lives of two others would be forever altered. Now, a family friend with violent tendencies stands trial for the shooting, but a lack of eyewitnesses threatens to derail the whole case. Will a jury find him guilty or will the angry suspect walk free?

Summary: On a warm, clear night in the desert near Lake Mead, the body of a man--shot dead--was found in the middle of the road. When Las Vegas Metro homicide detectives began investigating the death, they had no idea the case would lead them to a conspiracy that involved five people. Or that it would take six years to bring down the man behind the murder.

Summary: In Harris County, Deputy Jason Brown is called out on Easter Sunday to investigate the brutal shooting of a woman who was a school bus driver and mother of two. Meanwhile, Harris County Sergeant Sidney Miller takes on the murder of a young father, shot dead in a courtyard.