A newlywed receives terrifying emails with threats of kidnapping and death; the emails appear to come from an ex-girlfriend, but hiding behind the threats is a cyber-secret.

At first it looked like a home invasion gone wrong at the house Ralph Candelario shared with his second wife, but when police learn the antique dealer's first wife had disappeared, they take a closer look.

Before time runs out, detectives race to find a Little Rock, Ark., realtor who went missing after showing a house.

Dark secrets come to light as officials investigate what happened to a wife and mother of three who was found dead in her bathtub.

A couple's romantic boat trip turns tragic when a young wife is lost at sea. Did she accidentally drown or was it something more sinister? The case was cold for years until a model with a checkered past goes undercover to find the truth.

After a house fire in suburban New Jersey, investigators discover a twisted love triangle filled with jealously, love and murder.

She was a divorced mother excited about her next chapter in life. Then, five gunshots shattered her plans. Proving who murdered Joan Lockwood was a daunting task for police. An ominous killer was still out there and her family was living in fear.

This is a story about faith, temptation and secrets. A churchgoing mom was shot at point-blank range in her garage. Saving her would take a miracle and investigators wanted to know if this crime was random or if someone wanted her dead.

When Ricky Cowles and his girlfriend moved in together, her best friends moved in too; at first, it was like a big sleep over, then Rickie was found shot dead; his killer would let a secret slip, but turns out, he was keeping more than one.

Bob McClancy was a beloved detective. When his death was ruled a suicide, loved ones were suspicious. United by grief, his widow and good friend found themselves falling in love. Then Bob’s son started asking questions and uncovered a secret.

When a handsome veterinarian is found dead in a small Montana town, it launches a mystery that remains unsolved for years. After nearly two decades, investigators think they can solve it, but know convincing a jury will be no easy task.

Lisa Techel was newly married and pregnant when a shotgun blast ended everything. Police questioned the neighbour, who had a gun and a grudge. There were whispers that her husband had a secret. The case tested three juries then took one final twist.

Dave Kroupa and Cari Farver began a casual fling. Then Cari disappeared, but Dave was getting disturbing texts from her. It was a mystery that linked three women with one man in a case of jealousy, secret identity and murder.

This wasn't just any Halloween party. It was the big event of the season. Chelsea had her costume ready, sewed the leaves on herself. She was dressed as Poison Ivy, but never imagined she would encounter real evil that night.

Publicly they were a prominent family highly respected for their success. But privately a jury heard something else. It was case that pitted father against son, husband against wife and brother against brother.

On a warm August day, Ray Kotomski quenched his thirst with a cool drink. Kotomski was dead within hours. Investigators had to figure out what killed the happily retired Pennsylvania man, and also whether this was even a crime at all.

They were a married couple meeting for a secret Valentine's Day rendezvous. The secluded spot became a crime scene when Richard Schoeck was found shot dead there. Turns out, the rendezvous wasn't the only secret in their lives.

Jessie Blodgett was a budding musician and actress; the morning after a performance, Jessie's mother found her dead.

Tara Fitzgerald loved hanging out with friends. Like a lot of teens, she kept a few secrets from her folks. One turned out to be deadly. Detectives uncovered a disturbing trend endangering teens in their community and across the nation.

An Army captain, back from serving abroad, is found dead in her El Paso home. The news stuns her tight-knit military community. Her husband has an alibi, but what about her family and friends? Andrea Canning reports on a case with many twists and turns.

Jason and Julie Harper live the American dream in a picture-perfect home with three beautiful children, until the morning comes when Jason is found murdered; police are quick to discover who did it but proving why is much harder.

Carrie Olson had a heart of gold and a new man in her life. Then, she went missing. Loved ones launched a desperate search for answers, but investigators wondered if one of them was hiding a dark secret.

Sabine Buehler moves to an island off the coast of Florida for her own slice of paradise. When she vanishes, friends know she hasn't left on her own. Finding out what happened to her leads police down a long and winding path in the sand.

It takes a special eye to spot the thing that's out of place at a crime scene; in this case, that thing looks so insignificant, no one even knows what it is or what it means; it takes a team of determined investigators almost two decades to find out.

A young woman was found in the middle of the road, nearly dead. With little evidence to go on, investigators hoped to find out what happened from the victim herself. The problem was, she couldn't remember.