A pregnant day care worker is savagely attacked and murdered before her wedding in Mississippi; police must match their wits with a devious killer and untangle a case complicated by a lurid love affair.

A romantic anniversary getaway for a couple of high school sweethearts turns disastrous when they become victims of a robbery gone wrong; homicide investigators unravel a lurid secret at the heart of the murder, leading them to a stone-cold killer.

Happy newlyweds renovate a house for their future family when tragedy strikes; it isn't until a dark and twisted secret is revealed that justice is served for a devastating double homicide.

A second marriage for a divorced couple brings hope and happiness, until a tragic and mysterious death occurs; investigators must determine whether the bride believed she was fulfilling God's will, or if there is something more sinister involved.

While a young couple enjoy a romantic honeymoon, a brutal sexual assault and murder occurs; investigators must navigate a web of lies, suspects, and clues to bring a charismatic killer to justice.

An Ozarks country wedding brings hope and second chances to a Christian couple; but friends and family are mystified when they vanish in the dead of night from a farmhouse that had been given to them by the groom's mother.

Just five days before her elaborate Long Island wedding, a beautiful and brilliant Yale student goes missing; a massive search effort is launched to find her before her wedding day.

A mysterious illness strikes a newly married electrician, and his condition gets increasingly dire as doctors search for answers; it will take a scientific breakthrough to solve this burning mystery and catch a cunning killer.

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.

The holiday season between Thanksgiving and New Year's is often thought of as a celebratory period to spend time with friends and family. That is not always the case, though, as the period is not immune from experiencing the same types of violent crimes that occur throughout the year. This series documents stories of tragedy that struck during the holidays, with firsthand accounts from people who had friends or family members killed during the joyous time. Sometimes the victim is killed by someone close to them, such as a case of sibling rivalry turned deadly, but sometimes the killing is done by a stranger who interrupts a holiday gathering with gunfire.

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.

Social media was in its infancy in 2004, but the explosion in its popularity in the years since then has kept alive a missing-person case. Nursing student Maura Murray vanished in February 2004 after witnesses heard what sounded like a car crash. The case has led a legion of armchair detectives to come up with their own theories about the apparent crime on blogs, websites and podcasts. In this series, investigative journalist Maggie Freleng tries to unravel a slew of unexplored leads, eyewitness discrepancies and missing evidence that have cropped up online. She receives rare access to Maura's family and friends and talks with people who have dedicated countless hours to searching for the truth in the case. Freleng retraces Maura's last-known steps to try to find out what really happened and tackle the unanswered questions that remain -- perhaps most importantly, did Maura choose to disappear or was she a victim of foul play?

Most true-crime shows let viewers know the identity of the victim right away, before working their way into revealing the identity of the perpetrator. That's not how things work on "Killision Course," which conceals all of the participants' roles until the episode's final act. While working toward the conclusion, each hourlong episode re-creates a murder case involving a victim, accomplice and killer. Stories often involve friends or lovers who commit crimes against people who once trusted them. It's all part of the road leading up to the big reveal, which is when viewers learn what role each party played in the fatal act.

On May 30, 2005, 18-year-old Natalee Holloway disappeared on the island of Aruba. Her case resulted in a worldwide media frenzy, yet Natalee's body was never found, and her father, Dave Holloway, has never stopped searching for answers. Now, 12 years later, he's following what he believes to be the most credible lead to date: a detailed firsthand account from a man who claims to know the whereabouts of his daughter's remains, and the hope of finally getting a conviction of Joran van der Sloot. This true crime series follows Dave and T.J. Ward, the family's longtime private investigator, in the latest and perhaps final chapter of the decade-long pursuit to uncover what really happened to Natalee.

"How do I solve homicides with no bodies, no evidence and no forensics?" asks special investigator Karsten von Hoesslin, who found himself in such a predicament while trying to piece together the truth behind a quadruple murder at sea. In 2014, cellphone footage from a mysterious address in Fiji goes viral. The 10-minute clip shows four men clinging to wreckage in the middle of the ocean. Then, one by one, the men are brutally shot and killed. No one knows exactly where it happened, why, or who committed these crimes. In "Lawless Oceans," von Hoesslin relentlessly pursues clues and angles, tracks down and interviews eyewitnesses, material witnesses and families of the victims, and seeks the support of fellow experts to determine who is responsible. Along the way -- painting a dark, grim picture of lawless international oceans -- he encounters drug smuggling, people trafficking, illegal fishing, and piracy.

Oxygen's long-running "Snapped" true-crime series takes a look at cases involving women who are accused of murder. In "Snapped: She Made Me Do It," women are the supposed masterminds behind deadly acts, but aren't necessarily the ones accused of the crimes. As is customary with these types of shows, witness testimony, interviews with experts and dramatic reenactments are used to tell the story of each case. Viewers get both sides of the story in each case before finding out the jury's verdict. Romance is often at the core of the attacks.

The first three days after somebody is abducted are extremely important. Statistically, the chances of finding the abductee alive diminish significantly after the first 72 hours. "Three Days to Live" chronicles kidnapping cases, using re-creations and first-hand testimony from authorities and loved ones to illustrate what went on -- from the crucial periods early on in the cases, which all feature females who were taken, through the twists and turns the kidnappings took before reaching their conclusions. Journalist SuChin Pak narrates the hourlong series.