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.

Once dubbed "Wonderland" because of its immense summer beauty and grandeur, the rolling mountains and deep forests of the Pacific Northwest become a haven for a series of murders. Using stylized re-enactments and interviews with law enforcement personnel and family and friends of victims, episodes focus on a team of dedicated Portland, Ore., homicide investigators who seek answers to mysterious, disturbing murder cases. In the premiere, Det. Molly Daul realizes she is dealing with a sexual predator, whose chilling confession remains with Molly to this day. The killer then turns his sights on her, raising the stakes even higher.

Using stylized re-enactments to tell actual stories, "Forbidden: Dying for Love" delves into relationships that defy traditions, break taboos, and lead to heinous crimes. These star-crossed lovers -- from the couple who discard religious customs for love to the pastor who falls for the co-worker-- have tried to resist the forces that threaten to keep them apart. However, as Investigation Discovery says, "once they've crossed the line, anything becomes possible."

The maritime murders that take place in a lawless world on the high seas where jealousy, greed and rage rise to the surface.

"Breaking Homicide" seeks closure for desperate families whose loved ones were victims in murder cases that have gone cold. Former Rhode Island police Sgt. Derrick Levasseur investigates decades-old cases, chasing down new clues and providing fresh perspective to those who never gave up on the search for justice. Helped by local law enforcement, victims' family members and advanced technology, Levasseur meticulously dissects each piece of evidence, unearthing new leads in some cases.

Lt. Joe Kenda spent 23 years in the Colorado Springs Police Department, where he amassed a lifetime of memories catching killers and helping solve close to 400 homicide investigations. The vivid memories are brought back to life in this hourlong series, as Kenda reopens his "Murder Books" for viewers -- folders in which every detail of his murder cases is held -- to revisit the most disturbing cases still haunting him today. As he details the process of how he solved the crimes, Kendra also embarks on a personal journey, coming to terms with long-suppressed nightmares. As he says, "I don't want to tell these stories. I need to."

Living in a surveillance society means everyday actions are caught on camera, mostly of honest citizens going about their routines. Video, however, doesn't discriminate; criminals also end up on film. "See No Evil" presents dramatic stories of crimes being solved with the aid of surveillance cameras. Testimony from police, eyewitnesses and families are woven into re-enactments bolstered by actual security-camera footage, which helps unlock answers to cases that otherwise might have remained unsolved and left dangerous perpetrators at large.

Veteran journalist Paula Zahn steps out of the studio and into the field to unravel criminal investigations, tracking the drama of each story by featuring the opinions of those closest to the case, including law enforcement officials, the families of the victims and the incarcerated, lawyers from both sides, and first-time TV interviews with convicted murderers.

To hunt down the most heartless of killers, investigators must carefully gather clues to build an accurate profile, and there's always traces of the fiend somewhere left behind.

"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.

Psychological thrillers like "Fatal Attraction" and "Unfaithful" are the inspiration behind this true-crime series, which tells stories about relationships that quickly spiral into living nightmares. Each hourlong episode is a mini horror/suspense film that depicts actual events -- seemingly innocent encounters that end up changing the course of the participants' lives forever. Viewers see the evolution of each relationship and the escalation of extreme behavior, from a refusal to let go to a web of lies and betrayals, dangerous obsessions, scandalous affairs, stalking, and almost always murder.

Most homicide detectives would rather forget what they see at gruesome crime scenes. Pat Postiglione is not like most detectives. He has the gift of a photographic memory. Coupled with a laser sharp eye for evidence and the ability to detect microscopic clues, Postiglione is one of the most valuable detectives in his Nashville, Tenn., precinct. During his more than 25 years working homicide, he has seen hundreds of crime scenes, and he remembers each as if it happened yesterday. For the first time, he recounts his most memorable cases, walking viewers through the locations in exacting detail. Episodes feature each crime scene re-created based on police records and Postiglione's unparalleled memory.

The urgency and intimacy of local news reports capture the murder investigations that turned small towns and communities upside down.

In "Impact of Murder," Investigation Discovery uses the victim impact statement as a storytelling device. These statements are delivered in court allowing a family member or friend to describe the impact of a crime. They are a source of strength for those who feel helpless in the face of a senseless crime, and they help crime victims recover from the collateral damage inflicted, giving them a sense of power as they stand up in court to address the perpetrator. Through the victim's words, viewers come to understand the emotional damage endured as well as the significance of the life that was taken.

The emotional impact of a murder reverberates long after it is committed. "The Shadows of Death" explores homicide from the point of view of those who did not commit the crimes, but nonetheless feel as though they could have prevented them from taking place. Grief-stricken loved ones are haunted by guilt as they bemoan the actions they did take or failed to take. For them, they must either cave under the stress of survivor guilt or redeem themselves by coming to grips with their own involvement -- real or imagined.

"Murder Board" presents real-life stories about puzzling murder cases in which the evidence board plays a crucial role during the investigations. The murder wall helps investigators visualize the evidence as they develop theories and make connections. The wall evolves throughout each episode as clues are collected, crime scene photos are amassed, witnesses are interviewed, and suspects are identified. Some of the leads on the wall go nowhere, while others lead to startling breakthroughs that help the police to crack the case.

Investigation Discovery's series follows lovers as they embark on doomed romances that end in unexpectedly tragic ways. Each hour-long episode tells a tale of a love affair that turned lethal, from a husband who poisons his wife's Kool-Aid to a pet parrot repeating its owner's last words. Illustrated through split-screen archives and new materials, "`Til Death Do Us Part" includes interviews with family, friends and law enforcement personnel who paint a picture of love stories twisted by rage, curdled by obsession and crippled by paranoia.

Murder cases break wide open after investigators piece together what happened during a critical time gap.

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.

Dark dreams see the light of day in "Your Worst Nightmare," a typical Investigation Discovery true-crime series complete with jump-out-of-your-seat moments and chilling conclusions. Classic suspense film techniques highlight re-enactments of creepy, harrowing crimes, as victims' darkest dreams become unfathomable realities. Each hourlong episode features one story interlaced with commentary from law enforcement, criminal justice professionals, and psychologists, plus accounts from friends and family of the victim.

The sensational crimes that made national headlines during the 1990s.