Sixteen-year-old Angela Allen meets a man online, exchanges text messages with him and agrees to rendezvous with him in person, after which she is never seen alive again.

An aspiring boxer leaves in the middle of the night to meet an attractive young woman who contacted him on Facebook, then he is found dead in his car the next day, and his murder reveals a family secret kept hidden for more than 30 years.

A 28-year-old man becomes incensed after being deceived by an online prankster, and he seeks revenge against the only person he can think of -- the young woman in the pictures.

When Ashley Pegram goes missing after meeting a man through a dating app, the race to find her focuses on her internet admirer; detectives soon discover she is caught up in a nightmarish trap set by an online predator with murder on his mind.

When Grace's father discourages her from meeting online beau Robert in person, the two star-crossed teenagers hatch a plot that will change their lives forever.

Chris Coleman begins to receive threatening emails after taking a job as security chief at a Christian ministry, then his wife and two sons are found strangled to death, and police must trace the emails back to their source to find a killer.

A sociopath preys on vulnerable women.

Three girls meet a flirty and friendly guy online, then his demeanor shifts, and he traps the girls in a vicious game they can't escape.

Lonely retiree Alex Strategos finds comfort in the arms of a 69-year-old woman whom he met online, then he begins suffering from a wave of unexplained illnesses.

Fifteen-year-old Audrie Pott has no recollection of what happened at a friend's house party, then lewd photographs of her are shared through text messages, turning her world upside down and pushing her to the edge.

When a computer wizard fails to make the grade as a professional video gamer, he becomes obsessed with achieving internet fame; what starts as an online prank spirals into a new and deadly crime called swatting that chills the nation.

After moving to the idyllic town of Gulfport, Fla., Candy Williams meets a handsome stranger at the beach, but her storybook romance turns into a real-life nightmare as his past comes to light.

Texas A&M University professor Dr. James Aune's life goes into free fall when a secret online relationship threatens to come to light.

Seventeen-year-old adoptee Chelsea Schobert feels out of place at home, then she finds acceptance with Shawn whom she meets online, but as their relationship develops, the whole family is drawn into a devastating series of events.

Barry Hornstein accidentally detonates a pipe bomb in his driveway, which commences an online terror campaign against his 17-year-old son, Jack.

In Missouri, tragedy ensues when 13-year-old Megan Meier falls in love with a teenager she has met online.

Police use George Weber's on-line activity to help capture his killer.

A woman adopts a 6-year-old child through an online re-homing forum; she's soon inspired to help re-home other children but is horrified to discover that two of them may have fallen into the clutches of a child abuser.

Single mother Lorianna Parker meets good looking Corey Davis online, and she is filled with hope as their friendship blossoms, but when she meets him in the flesh, her dream date turns into a living nightmare.

When two teenage girls fall in love, their hedonistic lifestyle is played out on social media for all to see; behind the facade, petty jealousies and insecurities escalate until finally the pressure erupts in a frenzy of shocking violence.

Radio disc jockey Alan Lee Lama moves more than a thousand miles to be with a woman he met online, then her best friend gets involved, ensnaring Lama in a bizarre love triangle.

Powerfully emotional stories tell of people who have been targets of compulsive stalkers. According to the Centers for Disease Control and Prevention, more than 6 million people in the U.S. are stalked each year, and in most instances, the stalker is someone the victim already knows. The series' hourlong episodes dramatize actual cases through visceral re-enactments and pointed testimony of victims, family members and law enforcement authorities, revealing what happens when stalkers can't have what -- or who -- they want, and stop at nothing to ensure that no one else can either. The chilling accounts probe the mechanics of an obsessive mind and the devastating impact of delusion.

While most killers act alone, there's another type of murder that happens less frequently yet still produces horrific consequences. That's when people decide to kill as a group. This Investigation Discovery series details true-crime cases that involve victims who have been savagely murdered by their own friends. Stylized re-enactments featuring first-person accounts from law enforcement personnel and friends and family of the victims accompany each story.

Secrets are never safe from seeing the light of day, even ones that are housed with skeletons and buried six feet under. Those, especially, are of interest to law enforcement personnel, who unearth long-thought gone secrets that eventually help unravel murder mysteries. The details are described in hourlong episodes of "Grave Secrets," with re-enactments providing the meat and potatoes of each true-crime story, and interviews with victims' family, friends, and investigators adding context.

Transporting viewers into what Investigation Discovery calls "a vortex of dark mystery and psychological terror," the docuseries "Dead Silent" delves into actual stories of crimes set in desolate locations. Hourlong episodes portray just how dark and dreary the great outdoors can be when a person is deep in the woods, inside an abandoned house, or along the shores of a sleepy lake, and every snap of a twig and unidentified rustle can be a sign of danger. ID's signature storytelling interweaves commentary from local authorities, true-crime experts, and psychologists, plus first-person accounts from survivors of these crimes.

"Beyond the boundaries of ordinary life, there is another world that lies just outside of town, where places have no names." That's Investigation Discovery's introduction to "Murder Comes to Town," a true-crime series that reveals what can happen in solitary and desolate places. Hourlong episodes feature gripping tales of betrayal and murder buttressed by re-enactments and interviews with friends, family, and neighbors of the deceased, plus law enforcement personnel.

"Betrayed" reveals chilling stories of chasing the American dream and how the veneer can dramatically crumble, ending in murder at the hands of a trusted family member, co-worker, lover, or friend. The cases of deception are told through the lens of the fictionalized, first-person perspectives of the victims. As investigators, family, and friends peel back the layers and facts of each case, the otherworldly narrator already knows where the trail ends. The narrator guides viewers through various relationships, raising suspicions about who will commit the ultimate betrayal.

Chilling scenarios unfold in this true-crime series, which tells actual stories of people who shared their lives with loved ones who became killers. Each hourlong episode puts viewers in the shoes of the loved one, who first notices that something is amiss, interprets the puzzling signs and clues, and eventually comes face-to-face with the horrible truth: that the person has a very dark side. Exclusive interviews and firsthand accounts of the critical moments leading up to the vicious acts showcase devastating, often undiscussed consequences on the people who have nurtured, loved and raised a murderer.

Like a pane of glass cracking in all directions before shattering, the impact of a single crime can create ripple effects that forever alter multiple lives. This Investigation Discovery series unravels actual homicide cases to explore how the past continues to haunt the present for those involved -- loved ones, witnesses, and law enforcement. Each episode is structured around three distinct perspectives of the same crime, and as viewers learn different details by way of first-person interviews and stylized re-enactments, stories, which at first seem random, slowly start to intertwine.

No matter how complicated or seemingly straightforward a murder investigation may be, experienced law enforcement personnel always employ tried and tested methods to catch their prey. Documenting witness statements, pouring over forensic reports and crime scene photos, nailing down the timeline, and keeping an open mind about the causes and possible perpetrators of a crime are essential to an investigator's success. "Six Degrees of Murder" delves into another essential element that could be the difference between a solved case and a cold one. Featuring stylized re-enactments, each hourlong episode details how investigators untangled a complicated web of relationships before cracking a murder case.

There's a reason murder investigations don't begin with preconceived notions. Sometimes those least expected to be capable of committing such dark deeds -- respected role models and trusted members of the community -- can have a sinister side. "Unusual Suspects" documents baffling, challenging investigations, actual cases that were anything but cut and dry. Episodes feature in-depth interviews with leading law enforcement personnel combined with stylized re-enactments, illustrating how illusive offenders evaded capture for years before being undone by persistent police work.