When the body of a murdered young woman is found floating in the Gulf of Mexico, detectives spend years trying to identify her remains. But then a family stumbles across her description, leading to a 30 year old murder mystery that demands justice.

Hard-working family man Chris MacCallum disappears while on a camping trip deep in the forest along the border of California and Oregon. And when detectives start to unravel the mystery, all roads lead to an unthinkable suspect...

In Silicon Valley, young mother Reina Swierski is reported missing not by her husband Gary, but by her lover Ted. The search to find her goes on for years, eventually unmasking a violent and deadly predator.

When the murdered body of Miami pediatric nurse Beverly Jackson is discovered under the most shocking of circumstances, her family is devastated. In the end, it takes the bravery of one young witness to finally crack the case.

When 91-year-old Washington VIP Viola Drath is found dead on her bathroom floor in her tony Georgetown townhouse, it appears she's simply the victim of a nasty fall. But the subsequent investigation into her death unravels a lifetime of violent secrets.

Police discover a woman shot dead in a Catskills vacation house, just before it goes up in flames. The terrible conflagration masks even more terrible secrets, three deaths and a mystery that spans years - in this stranger-than-fiction tale.

When the nearly naked corpse of an older man is found along a horse path in Westchester, no one seems to know who he is. But after unraveling his identity, detectives are led on a four-state investigation -and learn his murder was based on a mistake.

When a 3-year-old child goes missing from a Cincinnati Park, the community mobilizes in a massive hunt. But before long, detectives realize that not all is as it seems to be and uncover a terrible secret.

When beautiful fitness-fanatic Donna Zinetti is discovered brutally stabbed to death on a jogging path, detectives immediately suspect her recently-estranged husband, Keith Longtin. But not everything is as it appears.

When Chicago detectives launch a program to identify the remains of eight victims of an infamous serial killer, they find themselves unexpectedly solving a 35-year-old homicide.

A body is found engulfed in flames in a Los Angeles alley. He's thought to be the victim of brutal gang violence, but a tip soon leads police to the victim's ex. When new evidence is unearthed years later, it's clear the police were dead wrong.

A strange case of a missing college co-ed pulls detectives into a disturbing online world. The investigation spans the globe and ends in Minnesota where an internet predator is unmasked.

Corey and Monique Kitts seem to be living the American dream with two children, a successful business, and a beautiful home. But when Monique and her children discover Corey's bullet-riddled body, the truth about their picture-perfect lives is revealed.

A troubled young mother mysteriously vanishes from her new home in Benson, Arizona where she had moved for a chance at a fresh start. Police uncover the truth of Devvra's disappearance when tips lead them through the seedy underbelly of Benson.

In El Cajon, California - a haven for Iraqi refugees - a young mother is brutally attacked in her home and left fighting for her life. A note left at the crime scene lead police to believe it was a hate crime. Was Shaima's Iraqi community also in danger?

In the shadow of the nation's capital, a mysterious death on a Marine base confounds the NCIS -- was it an accident, or was it a homicide? It won't be long before police are hunting a violent sexual predator whose trail leads right back to the base.

Ruth Vosseler's estranged husband takes their two young sons on an overnight trip in 1986, but they never return. Ruth's frantic search for her fugitive ex-husband and two young boys spans 28 years and unearths dark family secrets.

The peace in a small town is shattered when a Muslim couple is gunned down on the street. Though badly injured, the husband survives and tells police the gunmen yelled racial slurs before firing. But was hate the only motivation for this heinous crime?

A brazen assassination in a small Texas town sets the community on edge. With the killers on the loose, a team of special investigators tries to solve the case. They uncover a vicious revenge plot, but can they nail the killers before they become targets?

A terminally ill 87-year-old man is found dead from an apparent fall down his basement steps. But detectives soon realize the scene has been staged. Who stands to gain from the quick death of a dying man?

After he clashes with co-workers, Tom Monfils mysteriously disappears on the job at a Green Bay paper mill. Soon enough it looks like murder, but no one is talking to detectives. Is it a conspiracy of silence, or a tragic miscarriage of justice?

Mother of four Becky Sue ends her relationship with her abusive boyfriend, and decides to move in with a relative for a fresh start. However, some people suspect foul play when she suddenly goes missing before testifying against her abusive boyfriend.

A young mother from Austin, Texas suddenly drops out of contact. Police believe she may be taking a break somewhere, possibly with a new man. But Julie's family fears the worst.

A talented graduate student is nursing a broken heart, when she's swept off her feet by someone new. But as their relationship progresses, revelations make it clear nothing is quite what it appears to be. [also marked as S4:E1]

In Phoenix, a wave of late night sexual assaults appear to be the work of a serial rapist, who targets women in their own homes while they sleep.

In 1995, three members of a wealthy Taiwanese family living in Virginia disappear. Rumor has it they died overseas but when detectives investigate, they find answers closer to home.

A prominent psychiatrist and his adult son are killed execution style. When police can't find a suspect, the case goes cold. But when an attempted armored car robbery provides an odd link to the double homicide months later, a motive is revealed.

When Jamey Walker, a young woman with a bright future is kidnapped and murdered in the spring of 1981, her mother Eleanor dedicates the rest of her life to finding the killer in hopes of finding justice for Jamey.

When 12 year-old Courtney LeBlanc is kidnapped from her home, her family fears she's fallen prey to a serial killer terrorizing the community. Local investigators enlist the help of the FBI and their search reveals a predator hiding in plain sight.

Kidnapped just steps from her home, a 15-year-old girl is brutally assaulted and left for dead in Denver's South Platte River.

On Florida's Gulf Coast, young father Terrance Williams vanishes without a trace; Terrance's mother finds out that the last person to see her son before he disappeared has a curious connection to another man who went missing from the same town.

Life is good for 12 year-old Garrett Phillips, until he's brutally attacked while home alone. His killer jumps unseen from a window and investigators are left with a vexing mystery that rattles the otherwise peaceful village of Potsdam, NY.

When a paramedic and mother is found dead and covered in paint in the basement of her Massachusetts home, investigators must work tirelessly for 18 months to find the person responsible.

Teenagers Rebecca Bender and Bekah Charleston fall for men who seem to care about them. Instead, the girls are lured into human trafficking and coerced into prostitution.

When a young husband is thrown in jail for the murder of his newlywed wife, most people in their small Oklahoma community believed the case was solved. But odd cell tower records and surprising DNA evidence force investigators to take a second look.

In St. Petersburg, FL, Cabretti Wheeler and his friend Kyle Ellis are killed.  When the only eye-witness vanishes, it's up to Cabretti's mom, Lisa Wheeler, to help police solve the case, even if it means risking her own life for justice.

Margaret Purk is just days away from having her first baby when, after an apparent suicide by hanging, she and her unborn son are dead. Twenty-four years later, new clues lead investigators to re-open the case. Was this suicide actually a homicide?

On an Easter Sunday, 18-year-old Heidi Allen vanishes from her convenience store job. Two brothers are arrested for the kidnapping, but only one is convicted. Years later, a chilling new story emerges implicating three other men in the crime.

A small town is left on edge when a young mother is murdered inside her home. An early arrest and later, a surprising confession, point to a dark conspiracy and leads investigators to someone many people thought they knew.

When a California mother of two is stabbed to death in her bedroom, police can't find any incriminating evidence. The case goes cold for years until a new detective uncovers a tiny clue that leads to an undercover sting to catch the killer.

A woman driving solo to visit a friend on Florida's I-95 mysteriously vanishes. Her divorce leads police one way, but when her body is found it suggests something horribly different. Another woman who reads about the case has a hunch she knows the killer.

A missing cheerleader. A seemingly unrelated roadside fire. As two cases converge, police juggle numerous suspects and motives, until a cryptic surveillance video brings the investigation to a shocking conclusion of betrayal, devotion, and murder.

When a young woman vanishes from a New Mexico convenience store, two detectives discover tracks in the dirt that may lead them to answers. After a second woman disappears, it's a race against time to stop a potential serial killer.

16 year-old Brittney Gregory is a star student in Brick Township, NJ. When she vanishes one night in 2004, local police begin a search that leads them into a world of dark secrets and dangerous players as they work to solve her disappearance.

28-year-old Army veteran and beloved father of three, Joey Fulgham, is shot dead in his bed in May 2003. With so many suspects - Joey's wife, her jealous boyfriend, and even her protective teenage brother - police have a lot of ground to cover.

When an Arkansas outdoorsman disappears, authorities wade through a series of accusations and rumors in their hunt for the missing man. As they zero in on a suspect and the body count rises, detectives rush to capture the killer before it's too late.

In October 2016, after helping a friend fix his computer, 18-year-old tech prodigy, Sam Poss, takes off on foot and never returns home. Did the beloved teen run away? Was there an accident? Police work around the clock to find the truth.

In July of 2006, 22 year-old Tori Vienneau and her 10 month-old son, Dean, are both found strangled in their home. As San Diego Police delve into Tori's life, they uncover a complicated romance, a startling revelation, and evidence to make an arrest.