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A deadly fire burns a home and leaves one man dead; investigators assume the fire was an inside job.

A possible love triangle has deadly consequences for a prominent California lawyer.

When a determined son urges police to investigate the disappearance of his father, he meets a storm of family tragedy and betrayal.

When a young father is murdered in his apartment, investigators learn the victim was involved in a bitter custody battle prior to his death. A series of abuse allegations complicate the investigation as detectives race to identify the killer.

The investigation into the murder of a fellow officer plunges detectives into a cavern of secrets and lies.

The death of a Texas racecar champion leads detectives down a winding road of suspects and reveals deep, dark family secrets hidden for decades.

When a popular construction man in a tight-knit Texas town is found gunned down in his own home, it takes police a decade and a half to track down the killer.

When a Brooklyn native is found shot to death in the backseat of his car in a rough Atlanta neighborhood, police have to figure out if trouble followed him south or if the killer is in his inner circle.

A mysterious shooting of a religious family man leaves a community questioning if it was a drug-related slaying or a bloody family affair.

Twenty-one-year-old art student Katelyn Markham vanishes just weeks before college graduation; the investigation unfolds over 13 years, uncovering lies, rage, and a betrayal that hits close to home.

Craig and Laura Rideout appear happy but after they separate, an ugly secret is revealed and one of them will soon be dead; clues point to four possible killers and leave investigators wondering if this murder is all in the family.

A microscopic clue and a stroke of luck help authorities solve the murder of a young woman that took place inside her Jacksonville Beach, Fla., home.

A man dies in a shooting incident after tempers flare in a confrontation in Montana's Glacier National Park.

A woman and her dogs disappear from their home.

A 19-year-old woman with a promising future turns up dead with a single gunshot wound to the back of the head and the trail leads to a rogue police officer.

A nurse's loved ones worry something is terribly wrong when she goes missing, and with a harsh winter ahead, investigators race to find out the truth.

When a mother is found beaten to death and sexually assaulted in downtown Anchorage, police embark on an uphill investigation that includes groundbreaking forensic work, hours of surveillance footage, and an unlikely suspect.

After a woman is found shot dead, with her 9-month-old daughter in the next room, detectives uncover a web of late-night encounters, secret lovers and seething jealousy.

A woman is found stabbed to death in her apartment; with a long list of admirers, investigators uncover secret obsessions leading to a sadistic killer suspected by no one.

A single mother is strangled to death in the middle of a Hawaiian paradise; investigators quickly focus in on two suspects, but nothing comes easy as they spend more than a decade striving to bring her killer to justice.

A retired couple are found beaten to death in their country club estate, but detectives soon discover that what happens in Vegas doesn't always stay there as they hunt down this monstrous killer.

A young woman is stabbed to death and suspects include a warlock and a rumored Wiccan lover; the case goes unsolved for years, until a triple homicide leads investigators to a dark obsession that costs four people their lives.

Kelly and Steve investigate the tragic homicides of a pregnant mother and her two-year-old son who died in an apartment fire while her husband escaped; an arson specialist is called in to help make sense of the clues and catch the killer.

Kelly and Tonya delve into the grisly multiple murders of a young mother, grandmother, toddler, and newborn baby; forensic handwriting analysis could help identify the killer and author of a frightening message written on the wall.

Kelly and the team help the Lake Station Police department look into the 2007 slaying of a kind-hearted WWII veteran killed with a sledgehammer; tracing the purchases on his stolen credit card may be the key to solving the case.

The team helps the Abilene Police Department investigate the heartbreaking double homicide of a devoted mother and her young daughter strangled in their home; DNA evidence left at the scene might help identify their killer.

A man is found dead of an apparent suicide. But soon after, information emerges which reveals a much more menacing scenario.

A dismembered body is dumped on the side of the New Jersey Turnpike and before police realize it, bodies are turning up between two states.

A young bride-to-be is gunned down in her own home. The attack is personal and as investigators start digging, they uncover the man she loved was living a lie.

Tara Munsey went missing after a work shift at a Virginia restaurant and it is unknown if she ran away or if she was the victim of foul play.

An Ohio woman and her two daughters go missing while vacationing in Florida; their corpeses are found floating in Tampa Bay with a hand-written note by one of the victims; putting it on five billboards helps them find the killer.

Four young adults are murdered in an affluent Texas neighborhood, with little evidence but two people walking by dressed in black.

A young college student is found dead in her apartment and the autopsy rules the death a homicide by an unknown male suspect.

The killer removed the computer that links him to the murder of a woman and her soon-to-be ex-husband that he had met online.

A community is shocked when police discover a woman raped and murdered in broad daylight on a public trail.

A real estate developer is shot and his wife becomes the prime suspect, until the bullet is linked to a weapon reported missing 20 years ago.

A body is found stuffed into a suitcase forcing the police to search though the landfill for another missing victim.

A woman goes missing for a month with the only clues being a set of keys, a fingerprint and a code.

Police discover a mask near the crime scene and hope that it leads to the killer of a funeral director.

A killer assaults a young mother in her home, but despite meticulous washing of the crime scene, a single hair remains to lead authorities to the culprit.

A wealthy widow's sudden death perplexes investigators; with conflicting causes of death and millions at stake, suspicion falls on those closest to her.

A deadly crime spree hits rural Kaufman, Texas, taking the lives of two prosecutors; the murders set off fear in the community about who is targeting the protectors of justice; the truth hits much closer to home than expected.

Private investigator and former police officer Taylor Wright vanishes, but detectives think there is more to the story after her girlfriend receives strange text messages from Taylor's phone.

Private investigator and former police officer Taylor Wright vanishes, but detectives think there is more to the story after her girlfriend receives strange text messages from Taylor's phone.

With no arrest having been made years after a real estate agent's murder, frustration continues to mount among her family and friends.

Detectives discover the badly beaten body of a single young woman left bizarrely staged on her bed; fear in the community grows amid a rash of nearby murders until police are handed a break when a fresh look at old evidence points to the killer.

A cat-loving and recently divorced young woman dipping her toes back in the dating game is beaten and strangled in a brutal and unusual way; investigators dive into the murky world of online dating to hunt a killer who could be ready to strike again.

Five corpses are found on the Florida hog trails; the investigation stalls until two men narrowly escape the perp's clutches; years later, eight more bodies are found in nearby woods, leaving police to wonder if it's the same evil killer.

Multiple unidentified bodies are found inside barrels in a New Hampshire forest; decades later, a murder 3,000 miles away reveals their connection to a serial predator who targets women and children, and changes his identity after every violent kill.

When Kim Dorsey was found murdered in her bedroom, the chaotic crime scene left more questions than answers; a single out-of-place item would be the key to discovering the killer's identity if investigators could find the evidence.

When a woman's body is discovered at a trash facility, a detective makes a promise to her mother to get justice; she doesn't know she will come face to face with a serial killer.

Wealthy residents feel safe in their gated community but it is not safe for one millionaire, murdered in his waterfront home; police investigate but the case grows cold; turns out the key to solving it, or two keys, are right at the front door.

The save the date cards had gone out; Angie Ver Huel went to sleep next to her fiancé, Justin Michael, with big dreams but woke up to a nightmare; someone was running from their bedroom and Justin was dead.

A beautiful, popular graduate student is shot dead outside her apartment in Durham, North Carolina.

After the wife of a college professor and heir of an oil empire is found murdered in her South Florida home, footage from the home's security camera could hold the key to finding the killer.

A notorious serial killer, nicknamed Hannibal, murders several people while working as a confidential informant for the FBI.

For the Jennings family, Christmas Eve becomes a waking nightmare after a gunshot rings out, and investigators must determine whether a secret led to suicide or murder.

A notorious serial killer, nicknamed Hannibal, murders several people while working as a confidential informant for the FBI.