In Portsmouth, VA, a father comes home to find his 16-year-old daughter stabbed to death. With DNA and fingerprints police hope for an open and shut case. However, the case still goes unsolved for months until a piece of gum points to an unlikely suspect.

When Austin York, Matt Self, Mark Barbosa, and Rosa Barbosa are found dead in a McKinney, TX home, detectives embark on a three year investigation. And just when it seems like the murders may never be solved, an eyewitness breaks the case wide open.

Karin Strom is discovered strangled to death in her home. When a suspect emerges, investigators don't have enough evidence for a conviction. It will take twenty-six years to ultimately prove their case, and the final outcome surprises everyone.

Ann Branson is found stabbed and beaten to death in her Kentucky home. There is little evidence at the crime scene and investigators struggle to find a motive. Ann's financial records provide the break authorities need to help catch the killer overseas.

23-year-old Stephanie Bennett is brutally raped and murdered in her suburban Raleigh apartment. Investigators work the case for years but their leads go nowhere. A closer look at a peeping tom provides police the break they desperately need.

In Owego, NY, Michele Harris disappears on September 11, 2001. Would she really leave behind her four children and run away from her soured marriage? When blood splatters are found in the home, police begin to suspect that Michele may have met a more sinister end.

When the Korean-American Chae family is terrorized in their suburban home in 2009 in North Wales, PA, only three survive. Local investigators wonder if this is a robbery gone wrong or something more. As the case unfolds, police are shocked to learn of the betrayal behind the murder.

Bloomsbury, NJ, is the epitome of small-town America. When Monica Massaro is found viciously murdered in her home with her throat slashed, it rocks this town to its core. A tip comes in from 300 miles away to help police hunt down the killer, and the results leave residents shaken.

22-year-old college student Katie Sepich disappears one night only to be found raped, murdered and set on fire in a landfill the next morning. It's a case that leads Las Cruces, NM, detectives from the victim's inner circle to a potential serial killer and then back to their own front door.

When single mom Norma Rodriguez's murder in 1993 hits the town of Port Hueneme, CA, police are left sorting out the suspects in its wake. It will take a capricious witness and 10 years to clean up the damage. When the dust finally settles no one is more surprised than the killer.

When 27-year-old divorced father Jarrod Davidson is shot in the doorway of his Santa Barbara apartment, the neighborhood fears there's an assassin on the loose. As detectives dig deeper into Jarrod's past, they find out he got mixed up with the wrong person and a plant left at the crime scene is the key to catch his killer.

When Nikki Halpin, a divorced mother of 2, is brutally beaten at home in front of her children. She was found barely alive, but later died at the hospital. The residents of Safety Harbor, FL are terrified that a violent intruder is on the loose. But when a mysterious voice on the 911 recording reveals an eerie clue, detectives zero in on an unlikely suspect.

When 18-year-old Brittany Loritts is murdered in her Salisbury, NC, home in the summer before starting college, investigators are at a loss as to who would commit such a crime. The case gets hot when investigators find that the family home is built on buried secrets.

When 21-year-old Jamaican immigrant Dawnia Dacosta meets a hellish end in 1998, residents of Broward County, FL, are puzzled. Who would want to kill such an angelic, church-going young woman? Detectives are stumped until "divine intervention" strikes and luck leads them to a killer with evil intentions.

When 56-year-old widower David Lunz is gunned down in his Palm Harbor, FL, home, this laid-back community fears the worst. It takes investigators more than two years and a surprise clue found 600 miles from the crime scene to nail a killer from David's past.

The tiny town of Boonville, MO, is devastated when the body of 8-year-old Alyssa Owen is found near a rural country road. When another body turns up six weeks later, investigators soon learn the senseless brutality of this double homicide.

Grosse Point, MI is a privileged community untouched by homicide in over 60 years. So when bookkeeper Barbara Iske is found murdered in the driveway of a local home, the village is shocked. Police use the little evidence they have to catch the killer.

The small town of Poplar Bluff, MO, is jolted awake in 1992 when 31-year-old Laura Wynn is found sexually assaulted and strangled to death in her bedroom. And when a double homicide hits a nearby town, people are terrified. Thirteen years later their fears are confirmed when DNA proves the killer lives among them.

When 18-year-old Breanna Schneller is discovered stabbed to death and her throat slashed in her apartment where she lived with her fiancé and his brother, the residents of tranquil Wausau, WI, are stunned. Police hope a cell phone and surveillance videos can help them unravel the mystery surrounding Breanna's death.

The bloody murder of Beth Grosskopf in 2009 leaves the town of Freedom, PA, riddled with fear. Hopes for quick justice are dashed when the initial suspects don't pan out. But when someone reveals his inner demons, cops move in to catch the killer.

When accountant and two-time divorcee Geraldine 'Jerry' Martin goes missing, and is later found viciously murdered and mutilated in 1975, the city of Tulsa, OK, is left in fear. With no solid leads, it takes detectives more than 25 years and new DNA evidence more than 1000 miles away to warm up this cold case.

When 25-year-old Amy St. Laurent disappears after a night out on the town in 2001, the people of Portland, ME, are terrified. With no body, police don't know what to make of it. But their worst fears are confirmed when a shocking discovery proves murder.

The residents of the small town of Navasota, TX, are horrified when a pillar of their community, 54-year-old funeral home owner Lonnie Turner Sr., is found shot dead in his home. As investigators dig into the case, they discover this brutal murder may be a family affair.

The gruesome slaying of adored resident and wife 48-year-old Debra Rawls in 2004 leaves the small town of Summerfield, FL, paralyzed with fear. A swath of hooligans quickly deepens the suspect pool, but a speck of blood makes the biggest splash in discovering the true identity of the killer.

When Goshen, NH, resident 55-year-old Edith 'Pen' Meyer goes missing, the tiny vacation town fears the worst. Police find leads, but can't find the body. When a notorious resident reveals a grudge, police move in quickly to catch a killer.