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."

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.

Neighbors turn against each other with frightful consequences.

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.

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.

In this eight-episode series, viewers hear directly from detectives who investigated cases that haunt them to this day. These true-crime stories -- from mysterious vanishings to twisted family murders -- are the "unforgettable cases that disrupt law and order, and keep authorities up at night," says Investigation Discovery.

Investigation Discovery's "The Murder Tapes" chronicles homicide investigations using raw and unfiltered footage, including body-cam, surveillance and interrogation-room footage. Family members react in real time, investigators give their first impressions at crime scenes and suspects protest their innocence before coming clean. Viewers see and hear it all, getting up-close and personal with real-life murder investigations. Episodes track cases from start to finish, proving that the truth wins out when tapes roll.

Co-executive produced by none other than Khloé Kardashian, who knows a thing or two about sisterly bonds and how they can go awry, this series details shocking crimes committed by pairs of sisters. Sometimes the siblings work in concert, but often the duo turn against each other with the deadliest of outcomes. Hourlong episodes recount actual crimes via stylized re-enactments and interviews with immediate family members and close friends, painting a picture of where and why the sisters' lives went wrong. As well, investigators and law enforcement anchor each story as they recount firsthand their unraveling of the case and try to make sense of the crimes committed.

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.

There are manipulators in the midst, scheming right under everyone's noses. Even with people trusted the most, there may be something sinister lying beneath the surface -- a plot set in motion by someone close with a deadly motive. This true-crime series tells stories of actual murders committed not by strangers but by someone the victim knew, someone hiding in plain sight, or someone leading a double life. These wolves in sheep's clothing use deception as a weapon to try to get away with murder.

"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.

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.

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.

From the outside, families seem like harmonious units in loving homes. But you don't necessarily know what secrets families are hiding from the outside world. This series, narrated by actress Brenda Strong, explores families hiding the most extreme of family secrets: murder. Each episode explores a death in a family, unraveling the motives of the family members, all of whom are potential suspects -- and potential victims. Sibling rivalries, disputes over family businesses and infidelity are some of the factors that lead to the families' ultimate betrayals.

Hundreds of homicide cases in any given year can shake even the staunchest cities and police departments to the core. The statistics, however, don't paint the real stories and the effect that lingers -- through the pain endured by victims' loved ones, the community impact, and the memories that detectives will never forget. "Homicide City" explores unforgettable murder cases from major American cities, investigations that had law enforcement banding together across metropolitan landscapes in a sequence of manhunts. Each story is told by veteran homicide detectives, local reporters, and the victims' families.

What lurks in the shadows during graveyard shifts comes to light in this series, a quintessential Investigation Discovery offering that features nail-biting re-enactments of actual crimes in which darkness hides predators hungry for a midnight snack. Told through interviews with victims' family members and law enforcement, each story begins after a brutal crime is committed in the quiet of the night, and community members are left wondering who might be next. Investigators get to work, knowing that each time the sun sets, the body count might rise.

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

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.

Deep in the Colorado Rockies, there's a desolate region known as Prison Valley because it is home to 15 high-security prisons. One of the prisons is a federal supermax prison which houses Unabomber Ted Kaczynski and drug lord Joaquín "El Chapo" Guzmán. The valley itself is a safe community where residents look after each other. Nevertheless, a series of murders has rocked the community members in this beautiful, mountainous region of Fremont County, Colo. "Valley of the Damned" is a six-part true crime series featuring family members, police officers, witnesses, lawyers, and journalists who come together to talk about the string of murders that occurred in their remote community -- a place where evil put down roots.

Everyone is hiding something in "The Lies That Bind." It may be a harmless secret. Or it may be something far more serious -- a terrible betrayal or a shocking indiscretion. Investigation Discovery's true crime series tells the stories of murder investigations that expose one truth after another, revealing the sinister realities behind closely guarded facades and the dark underbellies of tight-knit communities. Investigators don't know whom to believe as interviewees harbor different points of view and tell wildly different stories.

"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.