In the 1990s, Louisiana is terrorized by multiple serial killers; the Zachary Police Department discovers the key to solving their cases when a pattern emerges with personal items missing from each local victim.

A serial killer taunts Wichita, Kan., for decades by sending brazen letters and taking credit for horrific kills; at the introduction of the computer era, the killer gets sloppy and accidentally leaves a digital clue.

The I-5 corridor in California is taken over by a brazen bandit who terrorizes the highway with a blitz of assaults and murders; the only clue to the killer's identity is a specific athletic tape used to bind his victims.

Numerous women are found dead by the side of the road with a unique ligature that looks like a dog collar and leash; detectives are stumped until a 17-year-old girl manages an escape from a vicious kidnapper, leading police to a serial killer.

Brooklyn shop keepers are afraid of closing time as a killer shoots his victims while locking up their stores.

Police find a string of murdered women in shallow graves in very remote areas of the Alaskan wilderness; after months of searching, police zero in on a local family man living a double life that no one suspects.

Minnesota police hunt for a killer caller who confesses to a string of murders in a chilling, high-pitched voice, begging for forgiveness; no one can identify him until one woman survives a brutal attack.

In the summer of 1976, the NYPD are chasing a man shooting at couples in parked cars with a gigantic, .44 caliber handgun; he taunts the city with terrifying letters until police get a lead about a suspect who has shot a neighbor's dog.

In the 1990's, New York is on edge as a killer leaves coded clues at crime scenes and declares his compulsion to choose victims by their birth signs.

When the Hillside Stranglers are caught police realize they still have another serial killer running rampant in Los Angeles; he tortures and toys with his model victims while keeping pieces of their jewelry as he snaps their last photo ever.

A rash of young men goes missing around Chicago during the 1970s; when bodies start washing up in the river, a pattern emerges; a small piece of evidence leads police to the home of a model citizen, where his furnace puts the suspect in the hot seat.

A killer hijacks the highways of Sacramento as several women are found strangled with their clothing cut into precise but odd patterns; a survivor leads police to a sports car driving deviant posing as a good samaritan to poach potential victims.

Dallas police discover three women murdered with their eyes surgically removed; police believe they have a deranged doctor on the loose until two rookie cops find themselves on the trail of a man with a talent for taxidermy and a hatred for women.

In New Jersey four bodies are found dismembered, bagged, and thrown in roadside garbage cans; the "Last Call Killer" hunted his victims openly in piano bars but no one suspected he could be hiding in plain sight, working as a local nurse.

Texas authorities have a killer riding the rails and leaving a literal trail of bread crumbs after eating at victims' tables; when more murders are linked, the FBI names a Most Wanted suspect and a national manhunt for The Railroad Killer ensues.

In 1990, a serial killer terrorizes the University of Florida's campus, killing five students in under four days; the Gainesville Ripper leaves behind a crime scene where all the victims have been stabbed but the females have been posed like dolls.

Some of the world's most notorious murders are the subject of "It Takes a Killer," which investigates the crimes from the perspective of the killers, trying to get inside their minds and determine their motives. Leading homicide investigators and experts from such agencies as the FBI and Scotland Yard take a look at the evidence pulled from crime scenes and profile the killer's behavior to try to piece together the details of each murder, explaining when, why and how each criminal committed the crime. For the wannabe detectives watching the show, the experts also reveal how the crime was solved -- which often requires authorities to think like a killer.

"Killer Couples" is in the same vein of the long-running true-crime series "Snapped," which tells stories of people who commit murder or attempt murder, but with a focus on couples who commit crimes. Using re-creations and firsthand accounts, each episode digs into a case, telling the story of the couple's romance, how the relationship evolved from love to manipulation, and what ultimately led the couple to commit the crime. The stories range from teenage lovers who go on a multistate crime spree to lesbian lovers who want to eliminate one of their husbands.

For more than 25 years, "Dateline" has brought viewers investigations into some of biggest mysteries in America. This entry in the franchise takes a second look at some of the most mysterious cases of recent history. Hosted by Emmy-winning journalist Craig Melvin, the show explores the stories through firsthand accounts told by people who are close to the crime, including investigators who dedicated their time to the cases and family members who are still trying to confront the tragedies that befell their loved ones.

Phoenix Coldon, a young African-American woman, vanished in December of 2011. Her SUV was found abandoned in the middle of the road in a crime-ridden and depressed part of St. Louis. When found, her car was still running with the key in the ignition, and her glasses, purse, shoes, and identification were all inside the vehicle. In the weeks that followed, Phoenix's family searched for answers and now, with the help of investigative reporter Shawndrea Thomas and retired Deputy Police Chief Joe Delia, they are getting the chance to unravel the mystery of Phoenix Coldon's case. The duo meets with Phoenix's parents, other family members, and friends to help them bring more exposure to the case and find answers.

"Murder for Hire" gives an exclusive look into the dark world of contract killings, showcasing some of the most fascinating murder for hire cases ever caught on tape. In an alarming trend, investigators are seeing a sharp increase in hired hits across the country, and those attempting shockingly include: housewives, wealthy bankers, military officers and even grandmothers. From scorned lovers to jealous relatives, the show explores in rare, never-before-seen footage, how a seemingly good relationship can go wrong and the emotions surrounding the reveal when an intended victim discovers a hit has been taken on their life. Each standalone episode features a different case of undercover agents immersing viewers into the real-life sting and investigation as they attempt to catch the perpetrator and ultimately prevent a murder.

This series delves into the psychological showdown that takes place inside actual police interrogation rooms and dissects what happens to yield a confession. Each hourlong episode takes viewers through the twists and turns of a real homicide case, from the crime scene to the suspects' questioning to the ultimate confession. The police officers and detectives assigned to each case reveal their methodology while interviews with the suspects' and victims' friends and family shed light on the crime. In every case, the interrogating officer will "break" the suspect and get a shocking reveal of what really happened.

Some lies are so life-changing that people are willing to kill to keep the truth from getting out; through twists and turns, investigators dissect how each complex lie turned into a horrific tragedy.

No one would suspect that the perfectly manicured lawns with trimmed hedges and fences lined up like toy soldiers would harbor such a secret, but sometimes things are not always what they seem. "Buried in the Backyard" examines true-crime stories about unfortunate victims found buried in the most unlikely of places -- the backyard. When the remains are unearthed, its the very beginning of an investigation, police piece together the person's identity and determine the cause of death before seeking the person responsible. Thrilling and captivating re-creations paired with firsthand knowledge from those closest to the victims can be seen as investigators track down the "why" and "how" and give viewers a shocking tale.

Stacy Keach narrates this dissection of the dark side of the American Dream, a survey of how far some people go to become rich, no matter the cost to themselves and those around them. Real-life cases are reviewed and involve such criminal activity as credit card scams, identity theft, counterfeiting and Ponzi schemes.

Retired NYPD Detective Kevin Gannon questions if the country's most notorious string of mysterious, accidental drownings are accidents or homicides and wonders if they could all be connected to The Smiley Face Killers.