A promising young attorney and a dedicated family man, Michael Fletcher seemed to have it all. But in the summer of 2000, Michael found himself standing trial for the murder of his pregnant wife, Leann. The verdict - guilty of second-degree murder - would leave friends, family, and the public at large scrambling to make sense of a twisted and frightening series of events that ended in the brutal killing of Leann Fletcher. What could possibly have led Michael Fletcher to commit such a gruesome act?

In the summer of 1985, in his exclusive Upper East Side Manhattan apartment, Robert Bierenbaum, a prominent surgeon and certified genius, strangled his wife Gail to death. He then drove her body to an airstrip in Caldwell, N.J., and dumped it into the Atlantic Ocean from a single-engine private plane. The next day he reported her missing.

For 20 years Daniel Paquette's murder in New Hampshire went unsolved. It remained a secret between two high school friends until Eric Windhurst's arrest in 2005. What was revealed was a crime born of adolescent passion between Eric and Daniel's stepdaughter, Melanie - redefining the meaning of loyalty, justice, and revenge. 

All Diane Bertalan really knew of her new husband, John, was that he was a widower, he lavished her with gifts, and he preferred to keep his past a secret. What she didn't know was that the FBI had been watching him for years. In the fall of 2000, she found out why - it was a crime that had been haunting authorities for decades. They called it the mystery of the Lady in the Box.

At first, the residents of Kauai Beach Resort took little notice of their new neighbors. The glamorous blonde and her tall husband fit the image of the ritzy gated community. The couple seemed to keep to themselves - until the police knocked on their door with a search warrant. Lori Vallow and Chad Daybell had fled to Hawaii in the midst of being investigated for the disappearance of Lori's children back in Idaho - Tylee and JJ - who hadn't been seen alive in five months.

He was a captain in the U.S. Air Force. She was a psychologist in Fayetteville, North Carolina. On the surface, Marty and Michelle Theer appeared to be the perfect married couple. But no one knew of the double life Michelle was leading. Tired of spending one too many nights apart from Marty who was often away on his flight missions, Michelle turned to the Internet to meet men and relieve her loneliness. With each encounter, Michelle became more daring in her sexual escapades. But one man stood out among all the rest: former U.S. Army Staff Sergeant John Diamond.

Susan McFarland watched, powerless, as her husband, Rick McFarland, went into a downhill spiral of get-rich-quick schemes, quirky shopping trips, and prescription-drug abuse. Susan, a rising star at a major corporation, finally had enough. When she decided to call it quits, Rick ended her life, leaving three young boys - ages 5, 8, and 11 - without a mother. A two-month long search by law enforcement and volunteers found no trace of the missing woman....

Greg DeVillers was a top biotech executive, and Kristin Rossum was embarking on a career in toxicology at the San Diego Medical Examiner's office. They seemed to be happily married, living the American dream. But only months shy of their second anniversary, Kristin found her handsome husband dead from a drug overdose - his corpse sprinkled with rose petals. By his side was their wedding photo. Authorities deemed it a suicide. Until they discovered that the rare poison found in Greg's body was the same poison missing from Kristin's office. 

Lacey Spears made international headlines in January 2015, when she was charged with the "depraved mind" murder of her five-year-old son, Garnett. Prosecutors alleged that the 27-year-old mother had poisoned him with high concentrations of salt through his stomach tube. To the outside world, Lacey had seemed like the perfect mother, regularly posting dramatic updates on her son's harrowing medical problems. But in reality, Lacey was a textbook case of Munchausen Syndrome by Proxy.

In 1985, two 27-year-old friends left their suburban Detroit homes for a hunting trip in rural Michigan. When they did not return, their families and police suspected foul play. For 18 years, no one could prove a thing. Then, a relentless investigator got a witness to talk, and a horrifying story emerged. In 2003, this bizarre case hit the glare of the criminal justice system, as prosecutors charged two brothers, Raymond and Donald Duvall, with murder.

When high school sweethearts Karen and Richard Sharpe married, they shared an interest in medicine, a desire for family, and a dream for the future. For Karen, that dream became a nightmare. After years of abuse at the hands of her physician husband, she put an end to their 26-year marriage. Fearing a crushing divorce settlement, Richard ended the marriage first by unloading a .22-caliber rifle into Karen's chest. The murder revealed more about the millionaire doctor - and his double life - than polite Boston society was prepared for.

In Washington Township, Michigan, on Valentine's Day, 2007, Stephen Grant filed a missing persons report on his beloved wife, Tara. The stay-at-home father of two was beside himself with despair. Why would Tara abandon him and their family? Was she involved with another man? Stephen's frantic, emotional search for Tara made national headlines, and the case was featured on Dateline among other television shows and news outlets. But key elements in Stephen's story still weren't adding up....

West Coast doctor Kenneth Stahl would do anything to free himself from his wife Carolyn. Then Adriana Vasco - Kenneth's former receptionist and mistress of nine years - obliged by introducing him to ex-con Dennis Earl Godley. The deal was set. Godley would murder Carolyn for thirty-thousand dollars. On the day after her 44th birthday, the trusting victim was lured to a lonely stretch of road. The deadly rendezvous took a shocking turn. Not only was Carolyn gunned down with a .357 Magnum, but Kenneth would also be killed.

On July 13, 2011, Laura Jean Ackerson of Kinston, North Carolina, went to pick up her two toddler sons. It would be the last time she was seen alive. Laura's ex, Grant Hayes - the father of her two sons - and his wife, Amanda, the mother of his newborn daughter, both pointed the finger at each other as the one guilty of murdering Laura, cutting up her body, and then transporting and disposing of the remains on the shores of Oyster Creek, Texas.

David Miller had a dream job and a beautiful family. But one perfect life wasn't enough. So he pretended to be an attorney, then a CIA agent. And he secretly married another woman. He juggled it all quite well—until the day his two wives found out about each other. Miller groped for ways to hold on to his finances and reputation. But when he tried using a gun to silence his second wife, his carefully constructed façade of power and wealth exploded.