A car fire blazing near a beach sends detectives on a search that ends with the discovery of a murdered woman; the killer's attempt to eliminate evidence actually gives investigators the clues they need to catch him.

Children find a missing woman's body in a rural community miles away from her home; forensic experts decipher surprising animal hair fibers and DNA evidence, which puts detectives on the trail of an enraged predator.

After a single father is found dead in his burning home, an autopsy reveals he was murdered; investigators must decode ballistic, chemical and digital clues to reveal a complex plan executed by a twisted killer.

A man calls 911 after finding blood inside a friend's home; officers enter to find a beloved community activist shot dead; detectives piece together clues, bloody footprints, bullet fragments and a credit card trail to find a cold-blooded murderer.

After motorists spot a man's body burning on the side of the highway, investigators find evidence of a brutal assassination and fiery cover-up; detectives decode construction debris with curious details to reveal a scheme that ended in murder.

After ranchers spot the body of a brutally beaten teenage girl on a riverbank, deputies conduct countless interviews but to no avail; finally, cutting-edge technology helps police lift DNA from the murder weapon and zero in on the killer.

After hunters discover the dismembered body of a missing woman, police uncover a shocking secret she kept hidden from friends; blood spatter and incriminating receipts help investigators decode her demise at the hands of a monster.

Reports of shots fired at an apartment complex lead police to the bodies of a woman and two of her children; detectives find answers in shell casings, shoe impressions and DNA to stop a diabolical predator.

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.

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.

Never forgetting what happened to loved ones who have been murdered is a way of paying respect, however horrifying and raw those memories may be. The recollections can come in handy too, like when they contain critical clues that help detectives piece together the final hours of the victim's life. This series examines that aspect of homicide cases, with each hourlong story told through the memories of family members, friends, and investigators, plus images from the time of the crime that still haunt and are unforgettable.

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.

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.