20/20 Show Summary, Upcoming Episodes and TV Guide

Former members of NXIVM, a professional coaching company, speak out about their experiences in the alleged secret society; NXIVM's litigation tactics against former members and critics.

Investigation into the 2002 murder of Christa Worthington and whether the man convicted actually committed the crime; a 2-hour special.

Following the life of Nathaniel Newman -- who was born with a condition known as Treacher Collins.

When former Marine discovered teen son talking to ISIS recruiters; How ISIS uses the internet to target young Americans for recruitment; The fight against ISIS's reach on America's youth.

Twenty-seven years after a Florida woman was fatally shot on the doorstep of her home by an assailant in a clown costume, police arrest her husband's new wife.

Las Vegas country music festival underway, as shooter prepares in hotel; Woman describes moment when husband was shot while holding her; Remembering the Las Vegas shooting victims.

Authorities set up an elaborate sting operation to catch a Houston couple who were allegedly attempting to hire a hit man to kill their exes.

Archival footage and new interviews provide a look at the arrest and conviction of Scott Peterson in the murders of his wife, Laci, and their unborn son, even as Peterson awaits answers to an appeal and a legal petition from death row.

A freshman at Northern Arizona University who shot four fraternity brothers outside of a party -- killing one -- claims self-defense, leaving the local community divided; interviews with the survivors and the parents of the young man who died.

A reality-TV executive receives a rare hand transplant after losing limbs due to a rare disease.

Molly Martens Corbett says husband was controlling, possessive; Former FBI agent, daughter charged with the murder of her husband; Molly Martens Corbett, her father head to prison for murder.

Footage of U.S. border officers accused of encouraging a 16-year-old to drink a dangerous liquid to prove he's not a smuggler; cases of border agents and officers being accused of abusing those crossing the border.

Investigation into the questions that still remain surrounding the 1997 murder of designer Gianni Versace.

An international investigation into Otto Warmbier's 17-month imprisonment in North Korea, and his death, which occurred less than a week after he was brought back to the United States in a state of unresponsive wakefulness.

When a 16-year-old girl accuses a classmate of raping her at a party, the investigation divides the small Alabama town.

Computer programmer and businessman John McAfee discusses being named a person of interest in the murder of his neighbor and the resulting tumult. He also discusses what his life is like today.

Two years after the interview during which she announced she was transitioning to female, Caitlyn Jenner reconvenes with Diane Sawyer to talk about the realities of her life.

Two mothers hire a private investigator Sheila Wysocki to search for answers concerning the mysterious deaths of their children, Lauren Agee and Jonathan Crews.

After spending 11 years in prison for allegedly murdering her mother, Noura Jackson is released and a new trial is ordered.

A 16-year-old gay teen whose mother sent him to a series of Christian-run youth camps that practice so-called 'gay conversion therapy'' talks about his experience.

The ex-wife of Justin Ross Harris talks about the death of their son and the ensuing court case.

A man claims his mother disappeared during an ill-fated fishing trip the two had embarked on.

Profiles of working individuals and families across America who are struggling to stay in the middle class; issues of dwindling job opportunities, income inequality and community solutions are explored.

A look back at the lives and careers of actresses -- and mother and daughter -- Debbie Reynolds and Carrie Fisher.

Entertainers and legends who passed away in 2016 are profiled, including Prince, Muhammad Ali, Florence Henderson, Fidel Castro, David Bowie, Glenn Frey, Merle Haggard, Pat Summitt, Arnold Palmer, Craig Sager, Gene Wilder, Doris Roberts and others.

Mark Carver, serving a life sentence for the 2008 murder of University of North Carolina student Ira Yarmolenko, speaks out.

The incredible story of Owen Suskind, a young man with autism featured in the recent documentary 'Life, Animated.' In 1994, when Owen was almost three years old he started to withdraw and eventually stopped speaking. At the time, not much was commonly known about autism, and Owen's parents, Ron and Cornelia, took him to a specialist who diagnosed him.

Journalist Gretchen Carlson speaks out about the sexual harassment she's experienced throughout her life; a former Wall Street trader talks about the sexist atmosphere he observed at work; lengths people will go to to prove harassment claims.

Babs Proller told ABC News' '20/20' that she hid a tape recorder during her conversations with federal prosecutors' star witness, Armando Morales.

Christopher Waide is convicted of the 2014 murder of 19-year-old Lea Porter and is sentenced to 48 years in prison; the report includes never-before-seen police interrogation videos, surveillance videos and crime scene photos.

After two trials, Kimberly Long was convicted of brutally murdering her boyfriend, Ozzy Conde, has spent seven years in prison, and, with the help of The California Innocence Project, she now has a new shot at justice. With her conviction overturned and the possibility of a third trial, 20/20 investigates whether she really committed this violent crime as the prosecution alleges. ABC News Correspondent Matt Gutman sat down with Kimberly as she tells her side of the story.

Friends, Family Stunned to Learn UNC Student Is Dead; FBI Develops Profile of Murdered UNC Student's Killer; Police Remain Confident They Will Find Faith Hedgepeth's Killer.

Diane Sawyer sits down with Elizabeth Vargas to discuss Vargas's secret struggle with alcohol and anxiety as revealed in her book 'Between Breaths: A Memoir of Panic and Addiction''; anxiety and alcohol abuse among Americans is examined.

Failed efforts to free American humanitarian aid worker Kayla Mueller from ISIS captivity following her 2013 kidnapping.

A suspect, Felix Vail, is investigated and tried for a 50 year old murder of his wife and the disappearance of two other women.

A family struggles to have their daughters apparent suicide reinvestigated as a murder

Dallas Ambush Shooting: From Peaceful Protest to Chaos; Dallas Shooting Suspect Wanted to Kill White Cops, Police Say; Black Parents on Talking to Their Kids About the Police.

Community Recovery czar Christopher Bathum is accused of sexual battery by former clients.

Bobby Brown on Forming New Edition, Then Solo Career; What Led to Bobby Brown, Whitney Houston's Divorce; Bobby Brown on Passion for Cooking, His Kids

With allegations of sexual misconduct spanning five decades from more than 50 women, it was only this past week that a Pennsylvania judge ruled that there is enough evidence to try Bill Cosby on criminal charges. Elizabeth Vargas brings the latest news in 'Cosby on Trial' - a legal battleground that now includes both civil and criminal actions across several jurisdictions - including Cosby's new defamation counterclaims against some of his accusers.

What happened to Kelsie Schelling? Twenty-one year old Kelsie mysteriously vanished into thin air in Pueblo, Colorado, over three years ago. The family says surveillance video, text messages and other evidence point to her boyfriend's involvement, yet, to their outrage, police have not yet classified the case as a homicide and have not charged him with a crime. But then a series of Facebook messages to Kelsie's mother raise new theories – is the missing girl's disappearance prompting someone to attempt extortion? '20/20' investigates and confronts those behind the mysterious plot and uncovers developments about what really happened to Kelsie.

Ron Miscavige, father of the Church of Scientology leader David Miscavige, speaks exclusively to ABC News Anchor Dan Harris about his son's journey within Scientology starting when the family joined in 1970, and then his ultimate rise to current leader of the Church. It is a rare look inside Scientology told by someone who lived it for more than 40 years, 27 of them working for the Church's Sea Organization. Ron Miscavige's experience with and ultimate break from Scientology in 2012 is recounted in his new revealing memoir, 'RUTHLESS: Scientology, My Son David Miscavige, and Me.'

What would drive a church-going Springfield, Missouri, woman and her daughter to fatally poison two family members with anti-freeze, and attempt to kill a third over a 14-month period? Diane Staudte and daughter Rachel both confessed to the murders of Diane's husband, Mark, and her son, Shaun, and attempting to kill her daughter Sarah, and are both serving life terms in prison. '20/20' takes viewers inside the case, revealing new details of the heinous murder plot. ABC News correspondent Deborah Roberts sits down with Sarah Staudte, the surviving victim, who describes how she discovered that her mother wanted her dead. The hour also features interrogation tapes of Diane and Rachel Staudte describing, in their own words, how and why they did it, as well as interviews with detectives, prosecutors, and friends and family members of the victims.

The 2012 shooting death of Ashley Fallis in her Colorado home is investigated to determine whether she was murdered or committed suicide.

ABC News' anchor Diane Sawyer has the first sit down television interview with actress Kate del Castillo. Del Castillo, the woman who was at the center of the controversy with Joaquin 'El Chapo' Guzman, discusses what happened and the danger surrounding the takedown of one of the most wanted men in the world.

A community theater actor tries to frame a veteran of the war in Afghanistan for the murder of a 23-year-old college student.

A jury decides the fate of Matt Leili four years after he was charged with the murder of his wife, Nique, who went missing from their home a week before being found dead.

After nearly 17 years, Sue Klebold, the mother of Columbine shooter Dylan Klebold, speaks on television for the first time ever about the tragedy, the victims, the relationship with her son and what it was like inside their home.

Investigative genealogist Pamela Slaton helps a man who was abandoned as a baby, a woman with a half-brother she has never met and a woman seeking her biological father search for their families.

The good and bad ways in which the lives of lottery winners changed; lottery winners discuss their paths to instant wealth.

When a wealthy doctor is found murdered in his Texas home, a tip leads investigators to the victim's girlfriend's ex-boyfriend.

A privileged teenager named Ethan Couch, who plead guilty to four counts of intoxication manslaughter, avoids jail time after psychologist Dick Miller claimed the young man's upbringing caused him to have 'affluenza'.

The Searchers: An investigative genealogist helps an army veteran, whose twins disappeared from his life in Korea more than 40 years earlier, find his children.

Mother and daughter reunion after 50 years, an unbelieveable injustice

Terrorist attacks on Paris

Actress Leah Remini reveals in an exclusive interview with ABC News '20/20' how Tom Cruise was one of the factors that led her to break from the Church of Scientology. 'Being critical of Tom Cruise is being critical of Scientology itself… you are evil,' Remini told ABC's Dan Harris in a new promotional clip from the interview. Remini, 45, describes how she and her family joined the Church when she was a young girl, built a successful acting career in Hollywood while being a diligent Scientologist, and how she eventually decided to sever ties with the Church.

'As time goes on, you start to lose touch with the real world. The mindset becomes ‘Us against them,'' Remini said. 'The decision to leave is you are giving up everything you have ever known and everything you have worked for your whole life.' The actress also details her 30-year association with the Church in her new memoir, 'Troublemaker: Surviving Hollywood and Scientology.' 'I feel that people need to understand this has been my whole life,' Remini said 'I want them to understand how it happens.'

The so-called 'affluenza' case of a Texas teenager who caused a fatal car accident that killed four people and severely wounded another made national headlines in 2013 when 16-year-old Ethan Couch's defense team used an unusual argument during the trial. During Couch's sentencing, a psychologist hired by the defense testified that the teen was a product of 'affluenza' -- a term used to describe Couch's irresponsible lifestyle associated with his affluent upbringing -- and that irresponsible parenting had 'strongly enabled' the accident, despite the fact that Couch had a blood alcohol level three times the legal limit on the night of the crash.

‘Shark Tank' Shark Kevin O'Leary Names His Top 5 Sales Techniques; What You Might Not Know About the Business of Mark Kay.

Melissa Moore, daughter of Keith Jesperson, was a teenager when she found out her father was a serial killer.

Investigative Genealogist Reconnects Lost Family Members; Why Did Chris McCandless Go 'Into the Wild'?

Insider Secrets at Restaurants and with Airplane Food.

Meet the teen who took on the popular coach, helping convict him of sexual abuse.

Author Rielle Hunter discusses her upcoming memoir and her relationship with former Democratic presidential candidate John Edwards.

Stories of people who took matters into their own hands to right a wrong.

They say good fences make good neighbors. But what about video cameras and the internet?

From an ex-HR exec to a porn-star-turned mom, confessions you won't believe.

From '50 Shades of Grey' to open marriages, what's going on with sex these days?

Yvonne Stern survived three hits put out by her husband's ex-mistress.

Does winning a lottery jackpot really buy happiness?

Just one week after police tracked down country star Mindy McCready, accused of kidnapping her five-year-old son, Zander, the country music star tells her side of the story exclusively to ABC News. On November 29, McCready, who does not have custody of her son, took him and fled to Arkansas during a visit with him. For the first time, McCready will reveal why she felt her son was in danger and the reasons behind the extraordinary lengths she took to keep him in her custody. She will also detail the dramatic moments when she and her son were discovered by police. The troubled star, now pregnant with twins, also explains the cryptic messages she sent early this week hinting that a judge found in her favor at a hearing in Arkansas.

Most polygamous families don't share their lifestyle with the outside world for fear of prosecution, discrimination and being shunned by their neighbors and the community - that is, until now. For the first time, the entire Darger family of Salt Lake City welcomes 20/20 into their polygamous home, risking prosecution to make their case for the right to freely practice their religion. Joe Darger, 42, has three wives and 24 children - but his family does not fit the stereotype of polygamists who wear 19th-century clothing and cut themselves off from the 'evils' of mainstream society. They are attractive, outgoing, educated and have successfully blended into today's society, with their children going to public schools and hanging out with non-polygamous friends and families.

Michael Jackson's death on June 25, 2009 stunned the world. To many, the fact that his personal physician, cardiologist Conrad Murray, was right by his side - being paid $150,000 a month to watch over a sleep deprived Jackson six nights a week - was also shocking. Now a jury must decide if Murray was negligent, ultimately responsible for Jackson's death.

For the first time since Bernie Madoff was arrested almost three years ago for orchestrating the biggest ponzi scheme in American history, bilking investors of billions of dollars, a Madoff family member breaks her silence and reveals never-before-heard family secrets. In an exclusive television interview, Stephanie Madoff Mack, widow of Bernie's son, Mark Madoff, who took his own life two years to the day after his father's arrest, speaks candidly and emotionally to ABC News Anchor Chris Cuomo about marrying into one of New York's most powerful families, living through the public humiliation of Bernie Madoff's financial crimes and coping with her husband's suicide. She also reveals for the first time a letter Bernie Madoff sent to her from prison after her husband's suicide.

In February 2008, 14-year old Brandon McInerney and 15-year old Lawrence King sat a row apart in 8th grade English. Just days before Valentine's Day, Brandon brought a gun to middle school and shot and killed Larry in front of his classmates. The unanswered question remains, why?