Dateline

A grad student gunned down. Friends said she had no enemies. But someone close was hiding a secret.

She hired a skilled marksman to train her in protection. But did she have a darker task in mind?

A soldier and father of five just back from Afghanistan finds an enemy much closer to home.

He was dashing. Now he was gone. Police investigate the strange disappearance of Gavin Smith.

A father of seven murdered. Disturbing clues have detectives wondering if this was a family affair.

Who would gun down a beloved school superintendent? An intimate email may hold the answer.

A wife and mistress battle for the heart of a man. Then a final showdown and someone ends up dead.

A woman strangled in a bedroom. Fear grows as others report chilling encounters with a stranger.

They built a life on faith and family. Then one was murdered and the other was under suspicion.

A newlywed finds his bride dead in the bathtub. Freak accident or murder? Three trials. One truth.

A veteran survived two tours overseas. Could she survive a dangerous obsession back home?

A mom vanishes. Does her online life hold the key to this mystery or is the answer closer to home?

As best friends, they shared everything. Maybe too much. Did a steamy secret lead to murder?

When a nursing student disappears, an electronic trail of chilling clues reveals a dark obsession.

Two murders. One big mystery. Enter the actors under the spotlight. What was real versus pretend?

The investigation into the death of a college student leads authorities to her theater group.

A hunter presumed dead. Was it an accident or murder? The steamy secret that exposed the truth.

Three best friends shared big dreams. Then, one vanished. Did a secret romance lead to tragedy?

They were inseparable, then she went missing. Inside a secret world: teens, social media and murder.

A newlywed dead. His bride suspected foul play. The mystery wasn't just who killed him, but how.

A tale of sex, betrayal and murder: Inside the deadly love triangle where three became a crowd.

Her mysterious illness baffled doctors. What killed her? Then the question for police became who?

When a healthy young doctor suddenly dropped dead, a medical mystery soon became a murder mystery.

His marriage went bad and he went missing. Did he not want to be found or was she hiding something?