Dateline: Secrets Uncovered

Newlywed Dalia Dippolito returns home from the gym to the awful news that her husband had been killed; in a case where almost nothing is as it seems, investigators want to know if Dalia is diabolical or an unwitting pawn in a hoax gone wrong.

When the dashing Gavin Smith vanishes, LA detectives are unsure if they are investigating a crime or a suicide; his wife claims he had gotten lost in drugs and flings; police wonder if the key to finding Gavin is hidden in one of those affairs.

Ashlea Harris has no shortage of admirers, so when she is found dead after a suspicious fire consumes her apartment, police are baffled; the fire is no accident but the clues to who killed Ashlea may be up in smoke.

Brandy Daniels believes someone is stalking her, then the single mother is found slumped over in her car, shot dead; investigators spend years navigating the twists and turns searching for her killer.

Debra Newell thought she found Mr. Right but her daughters sensed something wrong about John Meehan; they started digging into his past and their search for answers exposed a dangerous con man.

A young woman is shot in her home just outside Salt Lake City, Utah. Was it an accident? Or something far more sinister?

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.

A murder occurs in an affluent neighborhood with tree-lined streets; investigators find a riddle, a deception and a piece of pure evil.

Todd Winkler claims self-defense after being arrested for killing his wife, Rachel; investigators travel to Georgia to find out how Todd's first wife died on a camping trip 10 years earlier.

After finding his wife and two children dead in his garage, a former Indiana state trooper spends 13 years trying to clear his name.

Investigating whether an explosion in a rice field in Colusa County, California that killed farm manager Roberto Ayala is an accident or murder.

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.

Brittany Eldridge was nearly nine months pregnant when she was found dead in her apartment; investigators focused on two men they believed had a possible motive.

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.

Diana Lovejoy and her husband welcome a baby boy, but their marriage crumbles; a bitter custody battle follows; fearing for her safety, Diane turns to a man skilled in self-defense, but as it turns out, someone else is in grave danger.

Meghan Verikas is attracted to Leon Jacob, in part, because as a doctor he saves lives; police officers tell her he is trying to hire a hit man, potentially to take hers, but authorities have a plan of their own.

Sam and Danielle Dreher appear to have a storybook marriage, but this ending was not happily ever after; when Sam is murdered, investigators discover a twisted tale of secrets, lies and infidelity.

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

A group of adventurous Americans think they found paradise in a tropical hideaway, the kind of place where people don't ask a lot of questions about their neighbors, until some of those neighbors start to disappear.

What happened in Cara Ryan's bedroom is a mystery; she admits she shot her ex-husband, but investigators need to know if it was murder or self-defense; detectives hear several versions of the story, but for a jury, there is only one truth.

For a group of stage actors, life seems to be imitating art in the worst way when a young college student is killed; police believe they know who is responsible, but this mystery has a grand finale no one sees coming.

For a day that ended so tragically, it started with roses; Nathan and Denise Leuthold had known each other since grade school and together they built their family on faith, but in a flash, one of them is dead and the other is under suspicion.

Police believe a pair of double homicides in Nebraska, five years apart, might be connected; investigators working to solve the crimes fear the killer might strike again.

When a captivating, sweet natured single mom was found dead in her garage, detectives in Frisco, Texas uncovered a series of potential suspects, all of them connected in different ways to her complicated and secretive life.

After a woman falls to her death while hiking with her husband in Rocky Mountain National Park, rangers question if her death was an accident.

Two beautiful families were living out their dreams but gunshots in a parking lot revealed an ugly truth; investigators uncovered three lives tangled in a love triangle and there were many secrets.

He dreams of being the next Steve Jobs, a young entrepreneur who wants to change the world; but his world comes crashing down one morning with four gunshots; this is a crime of passion: a fatal triangle involving a husband, a wife and a boss.

Deede Keller has a loving family, a tight circle of friends and a new man in her life; when she vanishes, disturbing clues point investigators to a suspect with a dark secret; the case provides a twist that leaves the courtroom astonished.

It's Friday the 13th and something sinister is about to happen: a chilling double murder in an upscale home; the evidence seems to tell a clear story until investigators discover a marriage filled with secrets and a story that doesn't add up.

A quiet night is shattered when intruders terrorize a Florida couple and their young son, killing one of them; investigators question the initial story; a tip leads them to another family with dark secrets, and that's when bonds are tested.

Annie Kasprzak has a second chance at a happy life after being adopted by her case worker; then, the 15-year-old vanishes; her parents find a note in her room that reveals a secret Annie has been hiding.

Fire chief Keith Bryan is shot dead in his home, leaving police to wonder who would want to slay the local hero.

Beauty queen Nona Dirksmeyer plans a future with the boyfriend she adores, then she is brutally killed; the crime shakes her hometown and exposes someone with a secret past.

Kay Mortensen takes pride in preparing for every possible threat, then he is found murdered, and two of his loved ones wind up behind bars.

Jodi Arias' murder trial captivates the nation, exposing her secrets; however, the trial fails to solve the mystery of who this woman is behind her veil of lies.

A graduation party ends with a man's death and leaves two teenagers facing a long fight for justice.

The fire breaks out before dawn; after the smoke clears, a mother of two young children is found dead; it's the tragic end to a life that held so much promise, but for investigators, it is just the beginning.

Kevin and Morgan Mengel are happy at first, but when the marriage goes bad, he goes missing; police wonder if he simply left, but a family's relentless pursuit leads to a stunning confrontation and, eventually, the truth.

A family mourns the loss of a young mother in a house fire; authorities rule it an accident; years later, there is another accident and second loved one gone; investigating if this just a string of bad luck or the work of a calculating killer.

On Nantucket Island, Mass., a couple's connection is instantaneous, but their summer romance takes a tragic turn; it seems like an open-and-shut case, but there's a surprise in store.

A man makes a frantic call to 911 after finding his wife dead in a bathtub, but the couple's daughters lead police to investigate their father.

It is a story of obsession that boiled over into a brutal crime. Right away, one woman said she knew what happened. Yet, it took years to bring the alleged killer to trial and the verdict was far from the end of this case.

Aasha Davis moves to Hollywood with big dreams; her sister Lesley follows for support; Lesley goes missing and Aasha is desperate to find her; in a town built on deception, the police come up with a high-stakes plan to smoke out their suspect.

It is just before Halloween; Joel Lovelien and his fiancé head to a local bar packed with people in costume; Joel steps outside and walks into a troubling mystery.

Keith Reed is a highly-regarded school superintendent; when he doesn't show up at an out-of-town conference, it sets off alarm bells; investigators take a hard look at his love life for clues and make a startling discovery.

Kelli Bordeaux is just starting what she hopes to be a long career in the military, but fate has other plans; when she vanishes, friends and family launch a frantic search, but it is a stranger hell-bent on justice who uncovers the ugly truth.