In Colorado Springs, Colo., 27-year-old single mother Ashley Melnyczok is murdered in her home; while hunting for clues, police hunt down a cast of dangerous characters and uncover a heinous plot.

High school freshman Shaniesha Forbes' body is found on a beach in Brooklyn, N.Y.; NYPD detectives discover her social media life includes a list of 1,600 Facebook friends and possible suspects.

Indle King hasn't seen his wife, Anastasia, since she abandoned him at the Moscow airport; after returning to Seattle alone, King meets with detectives tasked with unraveling the series of events that led to his mail-order-bride's disappearance.

A couple returns home from a trip to find blood everywhere, signs of struggle and their teenage daughter missing; police stumble across her charred remains in the desert; digital clues soon lead police to a shocking secret and a deadly betrayal.

28-year-old Michael Sandy is an interior designer living in Williamsburg, Brooklyn. Michael loves music and making new friends on the internet. But in 2006, Michael's habit of trusting strangers he meets on the web will put his life in jeopardy.

Thirty-two-year-old Becky Brosnan goes missing; while a Myspace message says she's left to find herself, everyone says Becky would never abandon her children; now, detectives must piece together Becky's life to uncover what really happened to her.

Tiffanie Adams' body is found in a field; a small-town sheriff must retrace the expectant mother's steps to catch her killer; Tiffanie's online life points the way to a dark secret and a ruthless murderer.

Professor Tiffany Maher is a faculty favorite, and it's hard to believe she could have any enemies; then, the professor is murdered, leading investigators to discover her secret online life.

In the wake of a broken marriage, 28-year old Samantha Lezark's efforts to find love again leads to a fatal ending; now, investigators must follow her digital trail through different chat rooms to uncover her killer.

After losing his dream girl to an older guy, Seath Jackson launches into a bitter social media war with his ex and her new man; soon after, Seath disappears and detectives work to find out if this is a runaway case or something more serious.

In August 2015, Jeffrey Kebler is found murdered in his Clinton County, Mich., home; in order to track down his killer, detectives must follow a digital trail left behind by the victim.

Ty Underwood leaves her insular hometown to start fresh, vowing to be forthright with potential suitors about being transgender; her shocking murder exposes chats with anonymous men on a phone app.

While dating an older man, 18-year old Brittany Clardy's life veers from that of a model student to a lost soul, then she disappears, and her family panics; now, investigators must unravel her complicated life filled with secrets and regret.

Mikarah Sanders is shot in a home invasion on New Year's Eve; police dive into Sanders' digital world, learning that the killer has been under their noses all along, driven by rage to commit a shocking crime of passion.

As opposed to its sister series "See No Evil," which details unlawful activity rooted out with the aid of surveillance cameras, "Hear No Evil" uses authentic audio recorded at crime scenes to build each episode's narrative. The recordings, captured by victims' families, investigators and the killers themselves, reconstruct the murderous acts with the aid of first-person testimony, stylized re-enactments and video archive. The result is a series that ultimately lets viewers' imaginations and instinctive fears of the unknown come to the fore.

From the moment a homicide is reported, a file is assembled to document every facet of the investigation -- crime scene photos, notes and observations, forensic reports, witness interviews, suspect profiles -- and continues to grow with new information until an arrest is made and conviction attained. Investigation Discovery opens these "murder books" to tell haunting tales buried within the pages. Hourlong episodes take viewers back in time with details of decades-old cold cases using actual archival footage, crime-scene evidence and first-person interviews with lead investigators, unraveling the mystery and uncovering what broke the cases open.

Investigators reconstruct the tragic final hours in a murder victim's life in order to crack the case and find the killer.

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.

Eagle-eyed technical experts prove there is no such thing as a perfect crime as they assemble the pieces every criminal leaves behind. Dramatic crime re-creations and, sometimes, part of the investigations are a staple of the series. Some of the re-creations include alternate versions of the crimes, which are disproved by science. The show's episodes follow each case from the initial investigation until it reaches its legal resolution.

It takes teamwork and commitment to solve homicides. "The Shift" looks into the Indianapolis Metropolitan Police Department to show what's involved in solving cases, giving closure to victims' families. The series follows the department's middle shift -- 2 to 10:30 p.m. daily, considered prime time for killings -- as detectives go from an initial radio call dispatching a unit to the scene, to the moment a suspect is in handcuffs. With the IMPD, that happens more than in many other U.S. cities. Nationally, about 60 percent of death crimes result in arrest and indictment, but in Indianapolis, the department has nearly 80 percent success with these cases.

On the outskirts of Los Angeles lay the city's roughest neighborhoods, the stomping grounds for LAPD Detective Lindy Gligorijevicin in the late 1990s. During that time, the police department's Foothill Homicide Unit investigated hundreds of murders, but only Gligorijevic -- driven by the need to give victims a voice -- earned the moniker "the killer closer." In this series, she revisits her most shocking cases, detailing how she solved them and the ways in which she convinced cold-blooded killers to confess.

Here today, gone tomorrow. Thousands of people go missing in the United States each year, leaving behind only a mystery without any clues. Their stories are told in "Disappeared" through the voices of family, friends and investigators trying to solve the case, with each hourlong episode recounting the final stages that led to a person's disappearance. Interviews with experts including psychologists and forensic specialists provide new insights into what may have happened -- whether foul play was involved or the subject simply ran away.

"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.

Crime author and investigator Jax Miller and former police investigator Sarah Cailean tackle a mystery that has stumped authorities for nearly two decades -- the confounding cold case of Lauria Bible and Ashley Freeman, two Oklahoma teenagers who disappeared in December 1999 after the Freeman family trailer was burned to the ground. In the four-part documentary series, the investigators delve into the many strange theories of the case and unravel a much larger story of unsolved murder, allegations of cover-up and corruption, and a truth that proves even more incredible.