The Obsession

As rumors spread through a small town about who murdered a teacher's aide, the real killer gets farther away. A scientific breakthrough cracks the case.

The Ink Beads

A man is found dead with the letters "F E D" written on his chest. With little other evidence, police turn to the cryptic marking for answers.

The Rise

When a single mom disappears, homicide detectives look into men she matched with on dating sites, men from work and a lover with a violent past.

Ten of Hearts

A 20-year-old woman goes for a bike ride and never returns. Years go by without any evidence or leads until new technology breaks the case.

Heavy Metal

A navy lieutenant's death is ruled as arsenic poisoning. Investigators discover he had many enemies, but it takes years to uncover what really happened.

Knots

A building manager finds a woman dead in the bathtub. When questioned, the neighbor living downstairs lies to police.

The Reunion

A murder victim's final moments are caught on tape. The crime scene looks like a clear robbery-murder. Text evidence at first points to a jilted lover, but police identify a second suspect with a possible motive of deadly revenge.

The Orange Shorts

A husband wants a divorce, and his wife ends up murdered. But he has an airtight alibi. Police use forensic science to come to an unexpected conclusion.

Personal Penmanship

When a woman is shot in the suburbs of Michigan, surveillance video reveals it was a trio of killers. A handwritten note becomes a critical clue.

Full Circle

A serial killer is on the loose for two decades. Finally, an arrest is made and police discover someone unexpected is behind the years of crime.

Matching Palms

Detectives are determined to do whatever it takes to catch a criminally charged sex offender and murderer. They use a crucial piece of evidence: a palm print.

Incendiary

A house fire kills the only doctor in a small town. An arson investigation points to the son of the doctor's nurse.

Grave Justice

The case of a young woman who was murdered in Wisconsin remains unsolved for nearly three decades. Forensics from an unrelated crime provide new details.

Smoking Gun

An elderly man is shot and killed on a road trip. Random murders are among the hardest to solve, but ballistics give investigators an edge.

Pulp Friction

An explosion that killed a California farmhand was eventually linked to a bomb. Looking for a motive, investigators hear ominous rumors about a jealous rage.

Sole Mate

When a college student was stabbed in her apartment, suspicion fell on her roommate -- until a bloody shoe print revealed the real killer.

Marked for Murder

Texas detectives race to stop a killer targeting law enforcement. Finally, a single bullet casing uncovers the bizarre reason the killer wanted revenge.

Words Matter

When a young family is killed, investigators work to decipher the threats spray painted on the walls of the crime scene.

Last Dance

A young woman is killed but her boyfriend escapes a gruesome attack. After nearly 50 years without an arrest, a new forensic test exposes a man with a dark secret.

Dog Proof

After two workers are shot at a construction site, police zero in on one important clue -- one of the killers stepped in dog feces.

Mix Matched

A Texas ex-con was convicted for a murder he said he didn’t commit. From behind bars, he's determined to use forensic science to prove his innocence.

Matter of Time

Doctors couldn't figure out why a California woman kept getting sick. When she died, investigators found out someone had been lying.

Blanket Denial

The body of a 24-year-old criminology student is found wrapped in a blanket alongside a desolate road in Brooklyn, New York. Police discover the bouncer at a SoHo bar may be her killer.

Unraveled

When a 79-year-old woman is found shot to death in her home, investigators initially suspect her husband or a violent neighbor. Shell casings recovered at the scene and a high-tech database reveal the unlikely killer.

First Impressions?

A young single mother is abducted from a gas station and later found stabbed to death near an oil field. Detectives use shoe and tire impressions to weed out numerous suspects and find their killer.

Toxic Environment

When a 23-year-old Marine dies in his bedroom, doctors initially believe a heart attack is to blame, but when arsenic is found in his organs, his wife is charged with murder. A sharp attorney and toxicological testing uncover the truth.

Lost Connection

When an 18-year-old girl is abducted while talking on a pay phone, forensic evidence found on her clothing points police in the direction of a suspect who shockingly confesses that he didn't act alone.

In Deep

In a story of a kidnapping, ransom and murder ring in LA, a pair of retired scientists use sonar equipment to locate victims at the bottom of a reservoir.

The Telltale Marks

Patients at the VA hospital in Clarksburg, West Virginia, keep dying after experiencing shockingly low blood sugar levels. An investigation into their deaths reveals an overnight nurse was injecting patients with lethal doses of insulin.

Tell No Tales

A 70-year-old retired veteran is found dead on his boat after a bad sea storm. Detectives discover he was killed during an attempted robbery after winning $400 playing Keno.

The Maidenwater Murder

When a true-crime hobbyist connects a Utah Jane Doe to an Ohio missing persons case, detectives are hard-pressed to solve the decades-old murder.

Men in Black

An upscale apparel store in Bethesda, MD was the site of a gruesome scene; a 30-year-old employee was dead and her 28-year-old co-worker was battered and tied up. Surveillance video would shed further light on the motive.

Killer Alibi

California police are baffled when an innocent man’s DNA is found at the scene of a deadly home invasion. Authorities team with the man’s defense attorney to determine how the seemingly impossible could have happened.

Lil Miss Murder

Eight days after she had disappeared on her way to a family ski trip, an 18-year-old young woman's partially nude body is found floating in a river in Wyoming, Years later, DNA technology uncovers dark secrets that led to her demise.

Murder Mark

A young mother is found murdered in her home. From the onset, there are two suspects with ample motive, but an unusual interview and security camera footage has investigators pivot in a horrifying new direction.

The Scent of Death

A young Colorado mother suddenly vanishes on Thanksgiving Day. When police trace her cell phone, it leads them to a surprising character with an even more surprising story.

The Murder Irons

When the 18-year-old desk clerk of a beachfront condo is found brutally murdered analysts use brand-new mitochondrial DNA technology to prove the killer’s identity.

True Bugs

July 4th weekend leads to tragedy for a California family. To catch a killer, detectives use an unorthodox technique -- analyzing bug fragments -- to help put a murderer behind bars.

Murder on Helium Road

A Texas love triangle turns deadly, and it appears to be an open and shut case until technology tells the tale.

The Burn Test

A 33-year-old West Virginia husband and father seemingly dies in an accidental house fire. But a closer look at the scene reveals a more sinister case.

Broken Santa

A family mourns the unexpected death of a beloved grandmother at Christmas. Local police assure everyone that she was a victim of a tragic accident and that there is no foul play. But some things about the scene just don't add up.

Desperate Stakes

When the 20-year-old clerk of an Atlanta-area smoke shop is gunned down during a robbery, investigators have only descriptions of the killers and the make of their getaway car. Investigators used a videotaped confession to smoke out the killers.