The story of who murdered new accountant Jean-Raymond Blatti.

The young Mathilde Croguennec is found dead at the foot of a tree during a Teknival in Brittany.

An in-depth look at the investigation into Priscillia Ciatti's murder.

The investigation into Adeline Piet's disappearance spans several years.

Christophe Lejard was found dead by his son.

Willy Pomonti, a retired architect, is found savagely murdered in his opulent villa in La Celle-Saint-Cloud, near Paris.

An in-depth look at the investigation into Audrey Jouannet's murder.

The bodies of two widows are a luxurious property in Vevey, Switzerland.

The body of man is found bound in a suitcase that was floating in the bay of Lorient.

Valerie Bary is found stabbed to death in a bath tub by her husband.

Marie-Jeanne Meyer goes for her daily jog and three days later her mutilates body is found.

A mother and daughter found tortured then burned in their house near Aix-en-Provence.

Stéphane Kameugne's body was fished out from a canal in Châlons-en-Champagne two weeks after he went missing.

Jennifer Charron's body was found burnt in the forest of Royan, after being reported missing.

Belgian politician Bernard Ouessfal's wife is found on the bathroom floor with a mysterious bag next to her.

John Szablewski reported to police that his partner, Laurence Maile, had disappeared.

On the night of July 16, 2000 Richard Alessandri's life changed forever.

June 2nd, 2005, Nelly Crémel, 39, leaves her home to go jogging... never to return. Eight days later, after a vast search campaign, her body is found. There's no doubt that it's murder. The case soon ignites public opinion, even inflaming passions at the highest level of the state.

October 9th, 2001, After an ordinary dinner, Pierre and Gabrielle Labrell suffer severe abdominal pains. Taken to hospital, the couple die several days apart, after awful suffering. The food poisoning theory is quickly ruled out and forensic tests show the Labrells were poisoned with arsenic.

On July 15, 2010, Sylvain Dromard finds the body of his wife Laurence lying in a pool of blood in the kitchen. The crime was particularly violent and the theory of a burglary that went wrong is soon excluded. But investigators don't understand who could want the adorable hairdresser dead.

Dr. Jean-Louis Muller calls police in Strasbourg to report that his wife Brigitte has committed suicide with his gun in the basement of their home; initial theories support the suicide theory.

From the team behind CNN's highly rated original series "Finding Jesus" comes "Beyond Reasonable Doubt," an unscripted offering designed to broaden HLN's true crime audience. The hourlong series takes viewers deep inside the world of crime fighting through high-profile criminal cases that were ultimately solved by advances in forensic science or technology. Driven by first-person storytelling, episodes feature the lead detectives of each case and a supporting cast of forensic scientists who highlight how technology is changing the face of criminal investigations.

Solving a murder case is like completing a jigsaw puzzle, and the more pieces there are, the more complicated it can get. "Motives and Murders" tips its cap to the puzzle solvers of the law enforcement world, the criminal investigators who go to great lengths to bring notorious killers to justice. The one-hour episodes reveal the kinds of challenges, setbacks and dramatic revelations that detectives encounter to close complex, nontraditional homicide cases.

"Serial Killer with Piers Morgan" delves into the minds of depraved serial killers for the first time. These are individuals who haunted communities for decades, and viewers are given access to maximum security prisons to discover what drove these people to kill. Morgan meets with victims' families and law enforcement as he seeks to understand the actions of these killers and what it took to race against time to stop them. Mark Riebe and Lorenzo Gilyard are some of the people who are interviewed.

Some of the world's most notorious murders are the subject of "It Takes a Killer," which investigates the crimes from the perspective of the killers, trying to get inside their minds and determine their motives. Leading homicide investigators and experts from such agencies as the FBI and Scotland Yard take a look at the evidence pulled from crime scenes and profile the killer's behavior to try to piece together the details of each murder, explaining when, why and how each criminal committed the crime. For the wannabe detectives watching the show, the experts also reveal how the crime was solved -- which often requires authorities to think like a killer.

CNN is by and large still a cable news outlet, but a movement under the leadership of network president Jeff Zucker to provide more alternative, entertainment-based programming is clearly afoot, and "Death Row Stories" is a prime example. The documentary -- the result of a collaboration with Academy Award-winning directors Robert Redford ("Ordinary People") and Alex Gibney ("Taxi to the Dark Side") -- revisits compelling capital murder cases in the U.S., detailing the twists and turns involved in each as a thought-provoking exercise on the death penalty and the American justice system. Redford's Sundance Productions also partnered with CNN for the documentary series "Chicagoland."

"Las Vegas Law" combines the suspense of "Law & Order" with actual, unfolding criminal cases to give viewers unprecedented access to the justice system in a way rarely seen on TV. The series follows Clark County District Attorney Steve Wolfson, a team of prosecutors, and law enforcement officials in real time as they assess crime scenes, interview victims and witnesses, strategize cases and ultimately chase convictions in courtrooms. Episodes are shot in cinéma vérité and feature surveillance footage and photography.

Investigation on how two seemingly ordinary people can come together to commit heinous crimes.

A baffling real-life homicide case unfolds through first-person accounts of the police officers and FBI agents who defined their careers by solving it, aided by incredible investigative techniques from the likes of forensic analysts, trace evidence experts and crime scene technicians.