Dateline: Secrets Uncovered - Season 6

Newlywed Dalia Dippolito returned home from the gym to the awful news that her husband had been killed. In a case where almost nothing was as it seemed, investigators wanted to know: Was Dalia diabolical or an unwitting pawn in a hoax gone wrong?

Gavin Smith was dashing. When he vanished, LA detectives were unsure if they were investigating a crime or a suicide. His wife said he'd gotten lost in drugs and flings. Police wondered if the key to finding Gavin was hidden in one of those affairs.

Ashlea Harris had no shortage of admirers. So when she was found dead after a suspicious fire consumed her apartment, police were baffled. This was no accident but were the clues to who killed Ashlea now up in smoke?

Brandy Daniels believed someone was stalking her. Then, the single mother was found slumped over in her car, shot dead. Investigators would 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 but would the truth be discovered too late?

Heidy and Conrad Truman were an enviable couple with a bright future. Then, one fateful night, Heidy was found shot and, just like that, she was gone. In the aftermath, fingers were pointed but were they aimed at an innocent person?

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 felt safe in their gated community but it was not safe for one millionaire, murdered in his waterfront home. Police investigated but the case grew cold. Turned out the key to solving it, or two keys, were right at the front door.

The save the date cards had gone out. Angie Ver Huel went to sleep next to her fiancee, Justin Michael, with big dreams but woke up to a nightmare. Someone was running from their bedroom and Justin was dead. Why did the killer target him, sparing her?

A beautiful, popular graduate student is shot dead outside her apartment in Durham, North Carolina. Who would want her dead, and why?

It was an affluent neighborhood with tree lined streets. Violent crime was unheard of here until that morning when, under the very noses of the cops, a terrible murder occurred. Investigators found a riddle, a deception, a piece of pure evil.

When Todd Winkler was arrested for killing his wife Rachel, he claimed self-defense. Investigators learned Rachel wasn't the first Mrs. Winkler to die and traveled cross country to understand what happened on that camping trip a decade 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.

An explosion in a rice field in Colusa County, California kills farm manager Roberto Ayala. But was it an accident or murder?