A popular teenager is gunned down at school, but the shooter is no student, harboring motives far more sinister than the typical schoolyard spat; Rod Demery investigates an apparent break-in that culminated in a bloody showdown.

A 911 dispatcher is found slumped behind the wheel of a wrecked sedan with a bullet through his torso; to catch the killer, Rod Demery must retrace the victim's steps and untangle a web of accusation and innuendo spun by a shady cast of characters.

A mysterious accident on Christmas Eve leaves Tony Holden with a fatal neck injury, but the case goes unsolved; when Rod Demery reopens the investigation, he discovers a conspiracy between unlikely accomplices.

The cold-blooded execution of an affable middle-aged couple sends shock waves of fear through their normally quiet community; clues are scarce until Demery and Mayfield uncover a cache of threatening text messages from a pair of mysterious numbers.

Noah Randle is shot dead after masked gunmen crash a late-night birthday party; Detective Rod Demery is called in on his day off to untangle a sinister plot fueled by a bitter grudge.

The lifeless body of an elderly veteran is found prone on the floor in his home; all signs point to death by natural causes until Rod Demery finds a series of clues hidden in plain sight and uncovers a motive so cruel it shocks him to his core.

A jogger finds the bullet-ridden bodies of three friends abandoned in "The Bottoms" in Shreveport, La.; Detective Demery must venture into the city's seedy underbelly to catch a killer with an inscrutable motive and an evil disposition.

A mother of three is shot point-blank with a high-caliber rifle just steps from her front door; to catch a two-faced killer with a history of violence, Rod Demery must first win the trust of a family wary of the system.

A caller directs police to an eerily quiet suburban neighborhood where they find the lifeless body of McDaniel Smith; the circumstances are hazy, until Demery learns of a legal dispute and a "wannabe" hero with a history of violence.

A family man is gunned down while doing a favor for a friend; as Rod Demery searches for answers, he's confronted with a name from his past and an all too familiar tragedy; when more blood is spilled, Demery is pushed to his breaking point.

After a father of three is mowed down in a devastating hail of gunfire, police are quick to determine that the murder was carried out by more than one suspect, however, Demery is unprepared for just how many killers he'll need to bring to justice.

After two young children witness the gruesome murder of their mother, Demery makes it his personal mission to bring the killer to justice; he quickly zeroes in on two suspects but can't escape the feeling he's barking up the wrong tree.

After finding a body slumped behind the wheel of a sports utility vehicle, officer discover the driver has been shot in the abdomen; Demery connects the case to a pair of alarmingly similar murders and realizes there's a serial killer on the loose.

The discovery of a mutilated corpse prompts a sweeping investigation into a trio of murders, an unreliable informant and the most deadly cartel in Shreveport, La.; Demery must face off with the man who is pulling all the strings.

The lifeless body of an unidentified woman is found in a parking lot at an abandoned factory, then Detective Rod Demery is thrown a curve ball when he recognizes the face of the victim at the center of the crime scene.

A disabled fair worker is shot in the face for no apparent reason; to solve this tragic mystery, Detective Rod Demery must retrace the victim's final steps and string together a series of seemingly unrelated clues.

A community is left shaken after a body turns up near the local mosque; Rod Demery must untangle a web of lies and misdirection; as detectives close in on the killer, they stumble upon yet another unsolved crime.

Rod Demery is called to the scene of a deadly roadside shootout; when the smoke clears, he realizes the victim is someone he loves; then, an unidentified corpse hidden in the trunk of an abandoned sedan opens the door to a tragic mystery.

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.