20/20

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".

Convicted of murder despite the lack of a body, weapon or DNA evidence, Mario Casciaro speaks out about the crime he says he did not commit.

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

Criminal charges filed against comic Bill Cosby; Cosby's defamation counterclaim against some of his accusers.

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

Michigan state Rep. Todd Courser is caught on tape scheming to spread rumors he was involved in casual gay sex to help cover an extramarital affair between him and a colleague, Rep. Cindy Gamrat.

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.

An encounter in traffic during a driving lesson leads to a shootout and the death of Tammy Meyers.

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.

People try to free their children from a polygamist sect; a mother is confronted by the sect's parishioners; how federal investigations, lawsuits and apostates of the church are fracturing the polygamous community.

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.

Looking at defining moments in the careers of some of the most notable 2016 nominees, including Sylvester Stallone, Brie Larson, Bryan Cranston, Ridley Scott and Matt Damon.

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

David Muir reports on the deadly heroin epidemic that crosses all boundaries and has few treatment options.

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.

Tucked away in Manhattan's Lower East Side, a family with seven children lived together in a small apartment for more than a decade, but almost no one knew they existed. The children - one daughter and six sons - were raised in four small rooms, homeschooled by their mother and trapped by their father, who allowed them to leave the apartment they shared only for rare, closely supervised outings. Until one day in January 2010, when one son, Mukunda, a middle child who was 15 at the time, found the courage to break free. The story of the Angulo family was revealed through the award-winning documentary "The Wolfpack," focusing on the six brothers - Bhagavan, Govinda, Narayana, Mukunda, Krisna (now Glenn) and Jagadesh (now Eddie) - then ages 11 to 18, and their unusual upbringing, along with their passion for movies, so intense that they copied down entire scripts, constructed costumes and props, memorized lines and acted out entire scenes.

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

It was a bitter cold evening in April 2013 when sisters Samantha and Gianna Rucki ran away from their Lakeville, Minnesota, home. They left without their shoes or coats and disappeared into the night. But oddly, there was no manhunt to find them, no Amber Alert was issued and there were no police press conferences to provide updates after they went missing. The girls were found almost three years later, alive, healthy and living at a therapeutic horse farm less than three hours away from their family home. Now their mother, who denies having any involvement in their disappearance, is facing felony charges, and the circumstances of how and why these two teen girls vanished is a mystery beginning to unfold.

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.

"20/20" will report on the incredible life and untimely death of music legend Prince. The hour will be anchored by Elizabeth Vargas and will feature reporting from Vargas, Dan Harris from Prince's home in Minneapolis, Chris Connelly in Los Angeles, and Deborah Roberts in New York.

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."

Could someone ever forgive a mom who would abandon not one but three newborn babies within blocks of each other over a five-year period? It is an incredible mystery that is solved right before viewers' eyes, as "20/20" teams up with renowned DNA detective and genetic genealogist CeCe Moore. Janet Barnicoat, one of those three baby foundlings, started her search as many do, with a Facebook post begging for clues about her biological family. The post went viral. After hearing about her story, Moore volunteered to help her on her search. What followed is a bewildering and shocking story, as Barnicot discovers she is one of three siblings abandoned by the same mother. But once the three are reunited, they go on a quest to find that mystery mom responsible for the unthinkable. It all culminates in a dramatic family confrontation and a series of startling confessions. Even Moore, with her 16 years of experience, had never seen a story like this one – telling Elizabeth Vargas, "It just blew my mind."

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.

Jannie Ligons, a director of a daycare center in Oklahoma City, will never forget the night in 2014 when then-Oklahoma City Police Officer Daniel Holtzclaw pulled her over. Ligons' story of what happened during the traffic stop is exactly the same as the way Holtzclaw tells it, that is until, she says, Holtzclaw forced her to expose herself under the guise of searching Ligons, a 58-year-old mother of four and grandmother of 12, for a concealed weapon. Ligons is African-American, and Holtzclaw is half-white, half-Japanese.

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.

Fourteen-and-a-half years ago Michele Harris, a mother of four young children, disappeared without a trace from her luxurious home in upstate New York. Her abandoned minivan found at the bottom of her driveway on the family's expansive estate led many to believe.

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

Orlando Nightclub Massacre: A Timeline of What Happened; Orlando Nightclub Massacre: A Violent Attack on Prideful Community; Orlando Massacre Suspect's Father: 'I'm Really Saddened and I'm Really Surprised'.

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

New hope leads to further investigation into a cold case: the disappearance of Indiana college student Lauren Spierer.

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.

Jaycee Dugard Recalls the Day She Was Kidnapped; Jaycee Dugard's Mother Terry Probyn on Moving Forward; Jaycee Dugard Checks Off Items on Her 'Dream' List.

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

The FBI trails a family of dysfunctional bank robbers.

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

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

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

The investigation into the 2007 disappearance of a soccer mom reveals she had been running an escort business and one of her clients may be to blame.

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.

The investigation into the killing of a criminal law professor leads detectives to suspect the murder is the result of a family feud.

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.

After being indicted for second degree murder by a grand jury, Nick Hillary, a black man accused of killing 12-year-old Garrett Phillips, faces trial in an all white town. Garret's mother, Tandy Cyrus, reflects on the emotional aftermath of losing her son.

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.

University of Virginia's former Associate Dean of Students Nicole Eramo talks about the Rolling Stone article detailing the alleged gang rape of one of the school's students at a frat party.

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.

U.S. authorities scrutinize a supposed miracle cure for autism that a fringe church is promoting; employees faking injuries to receive disability; an American woman convinces people she is a descendent of French nobility.

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

A look at the life of Donald Trump and how he captured the presidency, featuring interviews with his family, longtime friends and campaign manager Kellyanne Conway.

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.

Kiefer Sutherland on Starring in ABC's Hit Show "Designated Survivor"; The Top Secret Bunkers the Government Doesn't Want You to Know About; How Poland Coped When Most of Government Was Killed in Plane Crash

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.

A conversation with Keith Papini, husband of the California mom who disappeared on Nov. 2, 2016, and was later found bound and injured 150 miles from her home.

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

He believes there was enough evidence to indict the Ramseys of a crime.

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.

Stories from the lives of George Michael and Carrie Fisher.

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