Investigating allegations against fashion mogul Peter Nygard, accused of sex trafficking dozens of women over several decades.

Insiders close to the Gucci family speaking out for the first time on network TV about the murder of Maurizio Gucci, the former CEO and third-generation scion of the fashion empire. The special will also go inside the investigation that exposed how the family's business was undone by jealousy, backstabbing, and ultimately, an act of murder, for which Maurizio's ex-wife, Patrizia Reggiani, was convicted.

Drew Peterson speaks to Natalie Morales in his first on-camera interview in over a decade about the murder of his ex-wife, Kathleen Savio, and the disappearance of his fourth wife, Stacy.

New evidence, exclusive interviews, and an in-depth look at Lori Vallow and Chad Daybell, the Idaho couple charged in the murders of Lori's children JJ & Tylee. Keith Morrison reports.

Investigators desperately search for a killer after Florida teacher Denise Hallowell is found murdered. Dennis Murphy reports.

Josh Mankiewicz reports the latest developments following an arrest in the Kristin Smart case; Craig Melvin reports on the mysteries surrounding the powerful Murdaugh family of South Carolina.

After a 27-year-old woman (Egypt Covington) is found murdered in her Michigan home, investigators quickly identify a person of interest, but years pass without an arrest. Andrea Canning reports.

Family members and investigators speak out for the first time since the mysterious death of spiritual leader Amy Carlson, known to her followers as "Mother God." Keith Morrison reports.

A man goes overboard on a romantic sunrise cruise with his wife on Lake Coeur d'Alene in Idaho. Investigators begin to think his death may not have been an accident. Insiders close to Lori Isenberg are speaking out for the first time on television after she was convicted earlier this year of murdering her husband Larry Isenberg. The case gained national attention after Isenberg claimed Larry had died in a boat accident. Keith Morrison reports.

Since James Chambers' disappearance in August 2014, North Carolina detectives and the Chambers family have searched for answers in the murder of the 28-year-old Fayetteville construction worker. Andrea Canning reports.

A triple murder divides a small town in Kentucky. As secrets come tumbling out, residents begin to wonder: How well do we really know our neighbors? Keith Morrison reports.

On the morning of September 11th, 2001, 40 men and women boarded a flight at Newark Airport bound for San Francisco. They were businessmen and women, retirees going on vacation, students headed home to school. Ordinary people on what seemed like an everyday flight. But the passengers and crew of United 93 would soon become part of the worst terrorist attack in American history. And their actions that day, banding together to fight the terrorists, would inspire the nation.

Our first full report on this incredible story aired in early October 2001. With the country still reeling from the 9/11 attacks, family members introduced us to the heroes of Flight 93. They recounted heartbreaking final phone calls home and the discovery of goodbye messages on answering machines. And they told a story of impossible bravery: how the passengers and crew took a vote and tried to take back the cockpit from the four hijackers in the face of almost certain death.

It's been 20 years since United 93 went down in a Pennsylvania field. This past summer we met up with some of those families again. They told us how they remember that awful day and how they've coped with their loss. They also brought us up to date on their lives today, 20 years later. It's a story of remarkable resilience.

Andrea Canning reports on the epidemic of missing and murdered indigenous women; how jurisdictional rules between tribal and non-tribal law enforcement can leave families alone in their search for answers; and on the growing movement demanding change. 

Lester Holt reports on how the investigation into the murder of four-year-old Barbara Jean Horn revealed decades of misconduct across Philadelphia's criminal justice system.

After a nightclub owner is gunned down in his home, Chicago police discover the death was a targeted killing, connected to a twisted sense of loyalty and tradition. Natalie Morales reports.

After a mother and son are found dead, it takes nearly a decade to unravel the case. Andrea Canning reports the latest, including how a second investigation led to a new and unexpected arrest.

A mother's search for answers in her son's murder raises questions about whether Chicago police detectives did enough to try to solve his case. Josh Mankiewicz reports.

When Kansas prisoner John Manard escapes with the help of Toby Dorr, a 48-year-old prison volunteer and mother of two, investigators scramble to track the pair down;

A mother of two vanishes, and nearly two years later her body is found in the San Diego Bay, but medical examiners say she had only been dead for about a month or two. Keith Morrison reports.

A wealthy surgeon's whereabouts remain unknown for years after he disappears on vacation in Greece, leaving behind his wife, financial ruin and mounting malpractice suits. Rob Stafford reports.

A Michigan community is shocked when a local mother is found stabbed to death. After the case goes cold for more than a decade, a bombshell reignites the investigation. Andrea Canning reports.

Correspondent Keith Morrison reports on the case of a horror film actress, accused of murder in a real-life plot twist.

Private investigator and former police officer Taylor Wright vanishes, but detectives think that there is more to the story, after her girlfriend receives strange text messages from Taylor's phone.

When Kathleen Schroll makes a phone call that names her killer right before her death, it leads to the arrest of a father for murder. But two trials and 12 years later, authorities begin to wonder if he was the victim, not the villain.

When a woman is murdered, a web of sex and lies is uncovered, revealing a prominent family's dark secrets. Detectives and an FBI informant tell Dennis Murphy about the case for the first time.

Exclusive new interviews and details on the deaths surrounding Chad and Lori Vallow Daybell, a case Keith Morrison has been on since it drew national attention after Lori's children disappeared.

Lead detectives in the murder investigation of University of Utah student MacKenzie Lueck speak exclusively to Keith Morrison about the case that made national headlines.

Amateur internet investigators, new DNA technology and a dogged investigator help police find a killer – and identify a victim for years known only as "Lavender Doe." Keith Morrison reports.

Witnesses see a woman handcuffed in a parking lot and taken into an unmarked car by a blond woman. But detectives can't find any record of an arrest. Where could she be? Josh Mankiewicz reports.

The parents of missing South Carolina woman Heather Elvis, Debbi and Terry Elvis, open up to Andrea Canning about the search for their daughter.

Former NXIVM members tell Kate Snow about life inside the controversial self-help group, and life since founder Keith Raniere's conviction on charges including sex trafficking and forced labor.

When Susan Woods doesn't show up for work, she is soon discovered dead in her bathtub; as police search for answers, they find a trail of victims.

When the owner of a school promoted as a place to help troubled girls is accused of abusing students, his daughter must decide whose side she's on. Keith Morrison reports.

Professional basketball player Lorenzen Wright goes missing in 2010 and is found dead ten days later; Lorenzen's mother insists she knows who murdered her son and is relentless in helping detectives solve his case.

A college student goes missing in broad daylight from her off-campus job at a softball field; investigators receive a mysterious phone call that changes everything.

A massive manhunt ensues after Lois Riess murders her husband in Minnesota and flees to Florida, where she kills and steals the identity of a woman she had just met.

When a University of Utah athlete is found murdered on campus, investigators learn that she had reached out to the campus police for help multiple times before her death.

When hikers find a 21-year-old UCLA student's body in a Los Angeles-area train tunnel, detectives wonder if Ron's interest in an alternative religion is connected to his murder.

Andrea Canning speaks with U.S. District Court Judge Esther Salas about the deadly shooting at her home in 2020 that killed her son Daniel and critically injured her husband Mark.

A romantic Mediterranean cruise intended to rekindle the love between a woman and her ex-husband leads to her vanishing; the investigation reveals secret recordings, a surprising star witness and an undercover hit man.

The families of George Floyd, Jacob Blake Jr. and Eric Garner open up together in a raw and emotional conversation about their pain, anger and frustration over police violence.