Dateline: Secrets Uncovered - Season 4 / Year 2020

Diane McIver was a successful businesswoman who enjoyed a lavish lifestyle with her husband. Then she was gone. It was a mystery riddled with privilege and power, but investigators needed to answer a crucial question: was this an accident or murder?

Divorced mother Joan Lockwood is excited about the next chapter in her life, then five gunshots shatter her plans.

Detectives believed two young children witnessed the brutal murder of their mother; the prosecution builds their case around what they thought those kids observed, but another version of events may be possible.

A story of teens, text messages and a convoluted search for the truth; Conrad Roy, who had shared a secret with someone close to him, had vanished.

Amanda Lindhout was a journalist braving the world's most dangerous hotspots. Then, she became the story. What she endured from her captors was terrifying. Years later they found her again and secret agents put a daring undercover sting into action.

For over a decade, El Chapo evaded authorities but one man was determined to catch the infamous kingpin. Former DEA agent Andrew Hogan comes out of the shadows to detail his search and capture with never-before-seen videos and photographs.

Angel's Landing was a community of free-spirits with Lou Castro at its center. Investigators were suspicious of the mysterious deaths happening there. Now, commune members have courageously decided to tell their stories in hopes of helping others.

Churchgoing mom shot at point-blank range in her garage; saving her would take a miracle and investigators want to know if this crime was random or if someone wanted her dead.

In the still of the night, strangers armed with knives destroy the lives built by a hardworking man and his doting wife.

Pizza deliveryman Brian Wells robs a bank with a bomb strapped around his neck, launching one of the strangest cases ever investigated by the FBI.

A bank executive tries to rob his own bank; investigators think it's an inside job but eventually learn the crime is connected to a spree carried out by men who managed to keep their identities secret, praying on people who did the opposite.

The Disappearance of Sandi Johnson: Journalist Craig Melvin explores some of the most chilling stories through first-hand accounts, told by those closest to the issue, which also includes investigators who are entrusted with solving the case and the families confronting tragedy.

Cousins Nick Brady and Haile Kifer were best friends; to their family, they seemed like typical teenagers; turns out, the cousins had a secret that led to tragedy.

After college student Angie Samota was stabbed to death, police had no shortage of suspects; a crucial clue narrowed their list to one name, but it would be years before technology and a tenacious friend came together to help unravel this mystery.

Single mother Marie Singleton falls hard for Andre Jackson, a single dad raising his two kids; the couple marries and seems happy, then Marie vanishes and investigators discover secrets that may be related to her undercover job.

Connie and Larry Hoagland built a life centered on faith and family. Then, a vicious attack threatened it all. Someone wanted Connie dead. But who? After a bomb exploded underneath her car, secrets started to emerge.

Eric Glisson was convicted of a murder he swore he didn't commit. To prove his innocence, he had to find the real killers, unearthing their long-held secrets. It would take years for the truth to be revealed, but could it set him free?

Raven Abaroa swooped into Vanessa Pond's life and stole her heart.  Then Vanessa discovered her dream man had a tragic past.  His first wife had been killed.  Was he a grieving widower or somehow involved?  Dark secrets were about to be spilled.

Wendy Trapaga is a beaming young bride, and just four days after saying "I do," she is found dead in a parking lot; investigators discover the newlyweds were keeping secrets, and there was also someone else involved with a secret.

In high school, Christian, Erika and Pedro formed a tight trio: best friends who excelled at academics and shared big dreams. When they went to college something changed. It started with a secret romance and ended in tragedy.

Nikki Whitehead was a single mom working toward a brighter future. She found love, moved into a nice neighborhood and enrolled in college. Then, tragedy struck. Police searched for answers but one thing was certain. This crime was personal.

Bill and Shirley Carter had raised a family on their sprawling farm in America's heartland. As their golden years approached, tragedy struck and the seeds of a mystery pitting one family member against another had been planted.

Vince Goslyn's military career was thriving and he had built a beautiful family; one night, the father of five was gunned down.

Amber Belken, a young woman with big dreams, is found murdered; three people know the truth if Amber was the victim of a robbery gone wrong or if the brutal crime was personal.

Before she disappeared, Heather Elvis was a young woman who was eager to make her mark on the world; investigators discover a lover triangle and think they have their motive.

Sandra and Jamie Melgar are high school sweethearts who are celebrating their 32nd anniversary, but the intimate evening turns deadly; to crack the case, investigators must uncover the secrets of an illusion that is worthy of the great Houdini.

Lauren Giddings was smart, charismatic and a newly-minted law school graduate. She had dreams of becoming a public defender, then she was brutally murdered. Her killer tried to pull off the perfect crime, but a secret recording exposed the truth. 

For an agonizing four days, the fear was paralyzing. A city was under siege. Six people had been gunned down, but how were the killings linked? A retired detective connected the dots, initiating the manhunt for a man with a gun and a grudge.

He was a single dad, a former firefighter dedicated to helping others. When he was found dead in his garage, police needed help. A neighbor's security camera footage revealed a hooded figure, but who was it? Someone was hiding a deadly secret.

Devoted to her faith and her five children, Chanin Starbuck deals with her divorce and tries to start a new life; after she is brutally murdered, the investigation reveals secrets.

A firefighter who is used to rescuing others is in desperate need of help when he finds his wife bloodied and motionless on the bedroom floor.

Beloved by his colleagues, Mark Hasse was a fearless prosecutor. He worked to put criminals behind bars and making enemies was a hazard of the job. He didn't know it, but a killer was lurking and Mark wasn't the only target.

After Johnny Altinger vanished, the trail of clues led investigators to a young director. Detectives worried that the case was a hoax staged by a master storyteller. Turns out, the script was darker than anyone knew.

Susie Casey, an outgoing mother of four, is going through a divorce when she vanishes; police investigate three men.

Linda Curry had it all: looks, a great job and a brilliant husband. When she got sick, doctors were stumped. Then, she died and police were as puzzled as the doctors, but not her close friends and family. They just needed someone to listen. 

Rachel Anderson was a vivacious single mom whose world revolved around her children. When she failed to show up for work one day, her kids panicked. Might her disappearance have anything to do with those terrifying phone calls she'd been receiving? 

Karen and Mark Duenas had a special marriage; the teenage sweethearts managed to keep the romance alive even after raising five boys together; a perfectly ordinary night that ends in murder tests the bonds of family.

A cold-blooded serial killer lurks in the woods, peeps through windows and stalks his victims in the dead of night.

At first, Mischele Lewis' new boyfriend seems almost too good to be true; she discovers her dream man has secrets; a single mom goes on a dangerous mission to find out the truth.

The neighbor of a tech giant who is living in paradise is found dead; suddenly, the entrepreneur extraordinaire is on the run, taunting authorities and tantalizing the press.

Wendy Ratte, a free-spirited mother of two, was missing. Police investigated: a bitter feud with a neighbor, a possible serial killer. Or, did danger lurk closer to home? It'd take an elaborate, undercover mission to finally crack this case. 

Barbara George was murdered in her comic store on Friday the 13th. The case went cold and her husband moved away, starting a new life with a new wife. But then there was a new prosecutor with an old connection to the case, and he wanted it solved. 

A football player was shot; his killer left few clues and the case sat cold until someone spilled a secret; what police asked the tipster to do next would make her a target.

It was a riveting mystery with two puzzling deaths, both at the same mansion. First, a boy was found near the bottom of the stairs and police ruled it an accident. Then, there was an apparent suicide at the guest house. What was really happening? 

Jessica Nelson was a hardworking single mom. Then, one morning, she was found dead in her home. The discovery left her family shattered and their ordeal had just begun. Turns out, the killer was someone they knew. 

Marie Carlson was radiant but behind the glow she hid a darkness. For a while, Marie drifted but, then, a pastor and his wife welcomed her into their lives. It was a spiritual awakening which made Marie's disappearance all the more mysterious.

Skylar Neese was everything her parents hoped for, but their world turned upside down when she vanished without a trace. At first, police thought she ran away but hints on social media pointed to a more sinister reason for her disappearance.