On March 29, 2016, Louise Dickey is discovered murdered in a bath of her own blood; with no imaginable motive for the homicide and no witnesses, detectives seek out surveillance cameras to uncover the shocking truth.

The brutal murder of an elderly landlady offers no forensic answers.

On April 3rd, 2017, Assistant Chief Deputy Clint Greenwood is shot dead at point blank range at the Harris County Courthouse outside Houston, Texas; no eye witnesses, but maybe security cameras lead them to Clint's killer.

After 24-year-old Amy Lord is found stabbed to death, police trace her movements using footage from five different ATMs in Boston.

Seventeen-year-old Casey Crowder vanishes early one Sunday morning after her car runs out of gas outside of Dumas, Ark.; with no leads and no witnesses, investigators are desperate to find any CCTV cameras that can lead them to the missing teenager.

Emily Lambert goes missing after spending the night at a hotel bar with her new boyfriend; two days later, she's found murdered on a piece of remote farmland; detectives scour CCTV footage from the hotel and bar searching for her killer.

Grainy security footage reveals what happened to 19-year-old college student Katie Poirier who vanished while working the graveyard shift at a gas station.

A man gets savagely beaten and stabbed to death in a parking lot in South Dakota; with little evidence left behind at the scene, police painstakingly piece together the victim's last moments in an attempt to find his killer.

The body of a woman who failed to return from work the night before is found in a churchyard at dawn, and police turn to the city's surveillance cameras to catch her killer.

Fifteen-year-old Elizabeth Ennen is seen for the last time when a family friend drops her off at home, but her mother says she never walked through the door.

When Marcel Reardon is discovered bludgeoned to death outside an apartment building, his friends deny all knowledge of his murder; detectives are convinced at least one of them is lying.

On Nov. 12, 2012, Atlanta entrepreneur Terry Porter is found shot dead execution style in his front yard; there is no forensic evidence or witnesses, so detectives attempt to use surveillance footage to catch Porter's killer.

On Nov. 21, 2014, Jessica Padgett disappears; the only lead is her abandoned white Subaru; surveillance cameras show her driving into a parking lot and walking down a back alley, never to return.

When 22-year-old college student Dru Sjodin vanishes following her shift at Victoria's Secret, investigators turn to surveillance camera footage to reveal the chilling reason for her disappearance.

British woman Sian O'Callaghan disappears after leaving a nightclub; with the clock ticking, detectives find footage of O'Callaghan getting into a taxi and race to identify the vehicle and its driver.

Considered a runaway at first, teenager Skylar Neese's remains are found six months after a surveillance camera captures her climbing out of her window at night.

On April 14, 2009, 25-year old student Julissa Brisman is found shot to death in a Boston hotel room; with no witnesses, investigators turn to surveillance cameras to find a serial attacker.

Tom and Jill Estes' bodies are found behind a dumpster in Festus, Mo.; police are baffled until a receipt leads to CCTV footage of a blood-stained suspect; a trail of bodies reveals a killer who must be stopped before he strikes again.

When loving couple Gary and Linda Haas fail to reach their vacation campsite, New Mexico State Police are called in to investigate. With no forensic evidence and no witnesses, all they can do is scour CCTV footage for clues to unravel the mystery.

Pregnant student Loretta Saunders vanishes without trace; her trail runs cold after she is spotted on CCTV at her apartment building, then police spot her missing car on a drive-thru camera and race to find her before it's too late.

Twenty-seven-year-old Jessika Kalaher is found strangled in her car in Cedar Park, Texas; with Jessika's wallet and car keys missing, detectives turn to security cameras in the hope of finding out who killed her.

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.

This series delves into the psychological showdown that takes place inside actual police interrogation rooms and dissects what happens to yield a confession. Each hourlong episode takes viewers through the twists and turns of a real homicide case, from the crime scene to the suspects' questioning to the ultimate confession. The police officers and detectives assigned to each case reveal their methodology while interviews with the suspects' and victims' friends and family shed light on the crime. In every case, the interrogating officer will "break" the suspect and get a shocking reveal of what really happened.

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.

Think "Cold Case" meets "CSI" with a bit of "Rizzoli & Isles" mixed in, then make it real. That's the formula for this unscripted procedural drama that follows two veteran female investigators as they attempt to crack murder cases that have lingered for years without answers and closure. Kelly Siegler is an attorney and former Texas prosecutor who successfully tried 68 murder cases in her 21 years on the job, including 20 capital murder death penalty cases in which she secured the death penalty in 19 of those trials. She gets help from veteran detectives, who dig into small-town murder cases that have gone unsolved for years in the hope of getting justice for the victims and their loved ones.

A violent home invasion and murder is caught on camera, but then one suspect turns into six and the seemingly open-and-shut case becomes a web of deceit, denial and discord. That's when the skilled detectives seen in this series enter the interrogation room, attempting to piece together the truth. The series explores the many rabbit holes within criminal investigations and the clever tactics used by cops to obtain confessions. Viewers see exactly what it's like in the rooms and are able to listen, verbatim, to the hair-raising conversations that end with convictions.

As Olivia Benson on "Law & Order: Special Victims Unit," Mariska Hargitay has earned rave reviews for her passionate portrayal of a female detective who deals with disturbing cases. Homicide police work is a gritty job mostly filled by men, but this TLC series salutes women who are dedicated to solving murder investigations. The focus is on three detectives working in Atlanta and Cincinnati, with cameras recording their relentless determination to bring closure to victims' families by pursuing the truth and putting the guilty behind bars. The detectives are Summer Benton, a five-year veteran of the Atlanta Police Department's homicide division; Jenny Luke, who has solved 70 cases for the city of Cincinnati; and Jennifer Mitsch, a member of the Cincinnati Police Department for 16 years, the last eight in homicide.