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Hours into her first shift, Investigator Cathy Lucci meets partner Dave Salvatore at the scene of her first homicide case. A 49-year-old male has been brutally stabbed and left to die with a blanket covering him. Investigators question anyone who knew the victim. There are a few suspects and many questions. But who was angry enough to stab a man 46 times and concerned enough to cover him with a blanket? With no clear answers, Lucci's first case is a complicated puzzle. Can she and Salvatore put the pieces together?

In Little Rock, Detective Chuck Ray is called to a scene where one man has been shot in the hand while another man lies dying outside of his apartment with a gunshot wound to the abdomen. Shell casings and clues point to a serial robber that police have been tracking. But the serial robber doesn't usually kill his victims. Could this be the same guy? And is he getting even more dangerous? When a shooting takes the life of another innocent victim weeks later, and the patterns seem to match, Ray knows he and the team must work quickly to get this serial killer off the streets right away.

Rochester Investigators David Salvatore and Tom Donovan arrive at the scene of what appears to be a straightforward domestic homicide only to discover that no one who saw the suspect knows his real name or whereabouts. Instantly, the case becomes a race against time to identify the suspect before he disappears. After employing a myriad of methods, from examining the Police Department's citywide network of digital cameras, to tracking cell phones, to good old fashioned detective work of talking to witnesses all over town, investigators are finally able to identify a solid lead. But will it lead them to the killer or another dead end?

Detectives Nate Sowa and Ray Diaz take on the investigation of a missing person case that may turn out to be a homicide. A witness reported seeing a 25-year-old male brutally beaten, and that same male has not been seen for days. Without a body, how do you prove murder? Two brothers are suspected of the beating, but Sowa and Diaz must determine if they committed a murder--so it's a race against time to find the victim alive, or find proof of his death. It will take cutting edge forensics to solve this case, and if the evidence doesn't add up, someone may be getting away with murder.

A late-night house party turns deadly when gunshots ring out and a nineteen year old man is found dead on the street. An off-duty fireman, who was driving home, witnessed the shooting. Soon Investigators Glenn Weather and Gary Galetta learn the name of a possible suspect from an informant, but the fireman and the people at the party don't identify him as the shooter. Did the informant tell the investigators a lie? Are the partygoers protecting the suspect? Weather and Galetta will have to dig deep to uncover the truth and bring this cold-blooded killer to justice.

Detective Jaime Baynes is called to the scene of a possible homicide. After interviewing a few witnesses, Baynes learns the victim ran 100 yards, coughing up blood along the way. He banged on a couple of doors crying for help, before falling on his back and dying in the grass. In his death grip is a folded-up dollar bill with methamphetamine inside. The medical examiner finds a bullet from a small caliber 25 mm gun had ricocheted around in his body, causing internal bleeding. At the crime scene, where detectives believe the shooting occurred, no shell casings are found. With no suspects or leads, the forensic team tests the methamphetamine for a unique chemical formula, which may lead them to the neighborhood that produced the drugs. Hopefully the drugs' formula and the signature way the drugs were wrapped in the dollar bill, can lead detectives to the source and a possible suspect.

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Kidnapped at gunpoint, Gracia and her husband Martin are forcibly marched through the Philippine jungle by Islamic militants who threaten to kill them; driving in the Idaho Wilderness, Michelle is impaled in the neck by a branch that burst through her window; Richard is abruptly woken by a knife-wielding intruder who attacks him while searching for money.

After finishing a surveying job in a remote forest area, Brent finds himself face to face with a massive seven-foot-tall grizzly bear that begins to attack him. In a desperate attempt to save her and her husband's life, Susan grabs the .22 caliber pistol in her bedroom and engages in a gun battle with three masked men who invade their house late one night. And Denise must fight for her life when she is brutally assaulted by a man who gains entrance to her apartment by claiming to be a maintenance man.

A mother is jammed into a trash can filled with snow and left to die by her ex-husband. A young woman scrambles to escape a gruesome pile up of injured bodies after an escalator malfunctions at a sports stadium. A bar owner is savagely set upon by three men in a random attack carried out as part of a gang initiation.

A man, high on the drug PCP, goes on a rampage, stabbing his 11-year-old daughter and viciously attacking and stabbing a neighbor and her son. A man is beaten unconscious by his building contractor, thrown into the back of his van and driven for hours across state lines with blood seeping out of a serious head wound.

Halloween in a small town is cancelled indefinitely when a young girl is kidnapped and killed on her way home from a costume party. Ten years later, a detective's obsessive attention to detail exposes a shocking mistake that kept the case's most obvious suspects on the streets for 10 years.

One family faces two unsolved murders of their loved ones. It takes thirteen years for detectives to uncover the one missing clue that can lead them to the killer: the hidden crime scene.

The longest running cold case of a law enforcement officer in the United States was the murder of Sheriff Lt. Joe Clark, who was shot execution style in his own home. Given his tough stance on drug crime, detectives become convinced his death is the beginning of a drug war. It takes 33 years for them to discover the truth.

When Sherry Leighty goes missing in 1999, her family is left wondering how a dedicated mother of three could vanish without a trace. A decade later, the cold case heats up when Sherry's sister launches a social media campaign to help solve her sister's mysterious disappearance. An online tip unearths the killer truth and a sinister family secret. This episode features an interview with Shelly Leighty, who never gave up on solving her sister's case, along with rare home video of Sherry and her family not long before she disappeared.

When 25-year-old school teacher Christy Mirack is found brutally murdered in her Lancaster, Pennsylvania, apartment in 1992, there is no shortage of suspects. Frustration and fear mount as each person is ruled out, one by one, and eventually the case goes cold. Twenty-six years later, in 2018, cold case detectives get a break when a relative of the killer uploads DNA to a public genealogy website. This story features a rare interview with the victim's brother and the forensic genealogist who helped crack one of state's first cold cases to be solved by familial DNA technology.

Near what's known as the hanging tree, the mutilated body of Timothy Coggins is found in late 1983. The investigation is thwarted and the case freezes for over 30 years, until a newly elected sheriff vows to bring the killers to justice.

A new fingerprint identification system known as I-AFIS helps Texas detectives track down a killer after three years of searching. And a Georgia investigator gets to the bottom of a 16-year-old murder case when he discovers where the victim's body had been hidden -- in the bottom of a well.

After 23 years, investigators finally track down the killers of an Atlanta policeman when the ex-wife of one of the killers phones in a tip; and a mother keeps the skeletal remains of the 3-year-old daughter she killed in a footlocker.

Our cameras follow Detective Manny Reyes as he investigates the 1990 murder of a Fort Worth, Texas woman. Reyes talks to the woman's two sons, who believe that her husband, Bobby, was the murderer. We then watch as one of the husband's relatives tells Reyes that Bobby has confessed the crime to him. To make the case even stronger, Reyes collects physical evidence that connects him to the crime. Finally, Reyes meets Bobby for a dramatic interrogation. Will he crack and admit the crime--or will he hang tough and deny it all?

The brutal stabbing murder of a Florida woman is solved when police find crucial DNA evidence in spit left on a pavement. And a man is put away for rape and murder when his footprint matches the footprint he left at the crime scene 18 years before.

A look at the case of James Allen Selby, a serial rapist who eluded police for years while attacking 11 women in five states - Oklahoma, Nevada, California, Arizona, and Colorado.

Police in Overland Park, Kansas, hunt for over 15 years for a serial killer who lures women to Kansas for sadomasochistic sexual trysts at hotels. With unprecedented access to surveillance photos and video from the investigation, we go inside the probe, highlighting the pressures the small-town investigators faced while searching for the cold-blooded killer.