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."

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.

Investigation Discovery and People magazine partner to re-examine some of the most high profile crime cases in recent history. The one-hour series brings viewers tales of betrayal, buried secrets and unsung heroes, ripped from the pages of one of the nation's top weekly magazines. These stories transcended news and became part of pop culture, revealing shocking twists, new evidence, and unexpected resolutions. Interlaced within every episode are exclusive interviews with People's journalists, archival footage, re-creations, and firsthand accounts by those closest to the investigations.

Audio recordings from investigations, including police interviews, recorded telephone calls and voicemails.

Investigation Discovery's "Relatively Evil" features fish-out-of-water stories about people who find themselves thrust into seemingly normal families harboring members capable of committing murders or carrying out kidnappings. Newcomers fall victim to the machinations of evil clans, causing them to question reality and their ability to distinguish between right and wrong. Too late, outsiders realize that the roots of the family tree have been poisoned, leading to depravity, treachery and even sadism. Each episode unfolds like a psychological thriller, as relationships become strained, red flags go up, and conflicts between relatives simmer before boiling over into full-blown crimes.

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.

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.

Using dramatic re-enactments bolstered by police reports and forensic evidence, Investigation Discovery delves into the minds of female killers in "Deadly Women." Each episode focuses on four different cases in which women, for a variety of reasons and with a variety of methods, chose to take the lives of others. Stories featured include more recent cases, like that of Andrea Yates, the Texas woman who in 2001 drowned her five children one by one in the bathtub and then called police, to older cases like that of the "baby farmer" Sarah Makin in 1890s Australia, who killed illegitimate infants left temporarily in her care.

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.

Neighbors turn against each other with frightful consequences.

The most terrifying criminals often hide in plain sight, looking as ordinary as a friendly next-door neighbor. Those regular Joes are the focus of "American Monster," precisely because lurking within them are psychopathic killers. Similar to Investigation Discovery's "See No Evil," the hourlong series uses personal movie footage of the monsters-in-disguise at home with family and friends, giving viewers a sense of how their lives are seemingly normal. Interweaved are the stories of their astonishing crimes and interviews with neighbors and loved ones.

With one quick click the internet allows people to share information like family photos and professional accomplishments, making it easy to ignore or forget that behind clever screen names and witty captions is a dark digital world with real dangers and risks. In hour-long episodes, "Web of Lies" unravels tragic stories of deception and manipulation triggered by online interactions, from predators lurking behind Facebook profiles to creeps scouring chat rooms for their victims. Re-enactments are buttressed by comments from law enforcement personnel, true-crime experts and psychologists, plus first-person accounts from friends and families of the victims.

"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.

Like trying to decipher the value of a book without ever opening it, judging a person by his or her outward appearance can be a mistake. Someone may look perfect on the outside, but even the most kind-hearted soul has a dark side looming. "Diabolical" is a 10-episode docuseries that delves into the minds of murderers, asking a simple question: "Why did they do it?" The acts were committed with extreme premeditation -- many were months or even years in the making. Tension builds in each episode as law enforcement taps into the methods of devious masterminds, aided by insights from forensic psychologists and psychiatrists as well as criminal profilers.

Journalist Tamron Hall leads a team of correspondents in this newsmagazine series. Each hourlong episode presents two complex and compelling crime cases, and Hall and the investigative team dig beyond the headlines to explore not only what happened in each case but also why it happened. Interviewees including detectives, prosecutors and psychological profilers -- as well as criminals and their victims -- reveal what caused people to turn to crime, then whether justice was served finally. Emmy-winning journalists Michelle Sigona and Angeline Hartmann, "America's Most Wanted" correspondent Tom Morris Jr., best-selling author Aphrodite Jones, and filmmaker Keith Beauchamp are also featured in the series.

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.

"It's not like in the movies," police Sgt. David White says, describing his encounter with a gun-wielding suspect that was captured on his body camera. The video is among those featured on this series, which offers unprecedented access to police units that are using this innovative and vital technology in the line of duty. The series takes viewers on the "ultimate ride-along" as they view the life-or-death, split-second decisions that those in law enforcement are forced to make on a daily basis. Each story weaves interviews with responding officers throughout to provide critical context to their decisions and to add additional insight to the life-changing, sometimes tragically fatal, moments.

From blushing brides turned cold-blooded killers to smitten grooms with shocking dark sides, "Fatal Vows" examines the criminal psychology behind deadly divorces. Guiding viewers through actual stories of love gone wrong are psychotherapist Stacy Kaiser and forensic/clinical psychologist Dr. Brian Russell, who examine each couple to better understand how the marriage turned from flawed to fatal. Stylized re-enactments are supported by interviews with family, friends, law enforcement, and potential victims of the crime, while Kaiser and Dr. Russell provide analysis on unions that break down until divorce and murder collide.

"The View" co-host Sunny Hostin brings her experience as a former federal prosecutor and current victims' rights advocate to her role as the host of a six-part series on Investigation Discovery. In the "Truth About Murder With Sunny Hostin," the legal analyst travels across the United States revisiting the country's most baffling cases. She interviews detectives, prosecutors, coroners, and victims' family members, delving into homicide cases that convulsed communities and gutted loved ones. Hostin travels to Santa Ana, Calif., where a man returned home to find his pregnant wife raped and murdered. She visits Galien Township, Mich., where a young mother was smothered to death and buried in a shallow grave near her home. She goes to Powder Spring, Ga., where a woman was shot execution-style in her kitchen. Hostin empathizes with victims' family members while highlighting the hard work of law enforcement personnel, detectives and attorneys who bring the guilty parties to justice.

Told through first-person interviews, stylized recreations and archival footage, ID's true-life crime series, "The Object of Murder," examines murders and the unique items that provided vital clues to the detectives tasked with solving them. In one episode, investigators find a missing woman's online journal that reveals the truth of what happened to her. In another, a man goes missing while duck hunting but leaves behind his boat and shotgun. Each episode showcases a different crime via interviews with loved ones who feel deep emotional connections to the objects that illuminated the events that changed their lives forever.

Investigation Discovery's true-crime series, "Home Sweet Homicide," explores murders committed in the sanctuary of victims' homes. Homeowners are suffused with a sense of safety after locking their doors, enabling their home security systems and turning on all their lights. However, cold-blooded killers violate this sense of safety, using it against their victims, who are taken unawares in the one place where they felt free from danger. Planning the perfect crime, home invaders become acquainted with their targets' routines and familiarize themselves with the layouts of their houses. In one episode, a young mother is found brutally murdered in her home in Chestnut Ridge, N.Y., and detectives scratch their heads over snowy footprints that lead up to her house but not away from it. In another, a top real estate agent vanishes after meeting a new client, and police must find out if anyone had a reason to harm her.