20/20

Mom says daughter suffered from illnesses and needed wheelchair, feeding tube; Gypsy Blanchard on what happened the night mom was stabbed to death; Man says he feels ex-girlfriend used him to kill her mom.

North Korean leader Kim Jong Un and his fractured family's 70-year dynastic rule; interviews with those who knew Kim Jong Un and his assassinated half-brother.

An investigation is underway in California after 13 siblings ages 2 to 29 were allegedly held captive in a home. 20/20 reports on the latest details coast-to-coast with those closest to the story.

‘Army of survivors' break their silence at Nassar sentencing; Larry Nassar defends himself in court; The repercussions from Nassar sexual abuse case.

Slender Man stabbing: Parents recall what happened that morning; 12-year-old survives being stabbed 19 times by her friends; What is Slender Man, the figure that motivated two girls to stab their friend.

Prominent Virginia couple found brutally murdered in their home; Detectives question daughter of couple found murdered and her boyfriend; Boyfriend, girlfriend travel to Europe during murder investigation.

The stars of the most influential romantic movies take viewers behind the scenes and dissects the most memorable moments from these classics.

As ABC's hit show "Roseanne" gears up to return to television this spring, the entire cast reveals behind-the-scenes moments, memories, and what to expect from the revival of one of TV's most iconic sitcoms in a special edition of "20/20." Returning actors Roseanne Barr, John Goodman, Laurie Metcalf, Sara Gilbert, Lecy Goranson, Michael Fishman and Sarah Chalke discuss the show's legacy and share what life was like starring on the No. 1 show.

Angelika Graswald, who was convicted of involuntarily killing her fiance, tells her story.

Man recalls last hours before son, wife were shot and killed; Dad survives son's murder plot that killed mom and brother; Son becomes prime suspect in mom, brother's murders.

Woman dies mysteriously in historic California mansion; Dead woman's family refuses to believe she committed suicide; Nearly seven years after mysterious death, civil trial begins

Investigating a little-known study headed by psychiatrist Dr. Viola Bernard that saw several sets of twins and triplets separated as infants, adopted out to different parents and monitored to study the effects of nature versus nurture.

The unsolved disappearance of a 5-month-old infant in 1997 is reexamined after two women contacted the baby's mother online, believing they may be her missing child. Included: a look at indictments that were made against the parents and then dropped.

ABC News' Amy Robach sits down for the first interview with Denise Huskins and Aaron Quinn, who describe the anguish they felt after authorities at the time dismissed Denise's kidnapping as a hoax, causing the case to be known as the "Gone Girl" kidnapping after the fictional book and film. Denise recounts her nightmare revealing new details about her harrowing hours in captivity and opens up about confronting her kidnapper, Matt Muller, in court. The couple discusses the damage the ordeal has had on their careers and personal lives, and what the future holds now that the truth has been revealed. The interview comes just days after Denise and Aaron reached a tentative settlement of $2.5 million with the city of Vallejo in their civil lawsuit for defamation and infliction of emotional distress.

Recently divorced woman starts dating man with a troubled past; Man, girlfriend allegedly behind murder-for-hire plot to kill their exes; Arrested for alleged murder-for-hire of their respective exes.

A convict's mother is interviewed about the great lengths she's gone to in order to prove her son is not guilty of murdering a college student in 2003. Included: details on an overturned conviction and a new confession in the case.

Strikes will establish a strong deterrent of chemical weapons: Trump; Pentagon officials remark on strikes in Syria

The event America's been waiting for - James Comey - his first interview since being fired by President Trump.

So many strong hardworking American women living paycheck to paycheck face threats, humiliation, & danger at work. Now Diane Sawyer reporting.

Woman recalls being branded as part of joining secret society; What former NXIVM members say about Keith Raniere's attitude toward women; How 'Smallville' actress became involved with NXIVM.

‘East Area Rapist' terror grips Sacramento as number of victims rises; Authorities say at least 12 killed by 'Golden State Killer' across California; 'Golden State Killer's' spree allegedly began when he was a cop.

'Oh, here we go,' Southwest pilot recalled saying after hearing a bang; 'It was terrifying,' recalls passenger on deadly Southwest flight

A look at the two most important women in Prince Harry's life.

Memorable moments from Prince Harry and Meghan Markle's wedding.

Summer blockbuster stars reminisce about time on set and reveal little-known facts on special edition of "20/20".

Reports on ankle bracelet monitoring failures and murders committed by people ordered to wear them.

Woman's sudden death raises family's suspicions; Sheriff acknowledges missteps in handling dead woman's case.

Mom discovers daughter brutally attacked by man with shovel; Attack survivor undergoes hypnosis to remember details about assault; DNA match links man to near-fatal shovel attack.

Woman is convinced stepfather asked Pagan biker group to kill her mother.

'I felt nervous and worried': 12 boys, coach trapped inside Thai cave; The moment when 12 boys, coach trapped inside Thai cave were found alive.

Adults abandoned at birth turn to genetic genealogy to find biological family; Adults abandoned at birth meet biological family members for the first time; Woman meets biological sister for first time, finds another long-lost sibling.

Parents fear for young daughter's safety as her behavior changes dramatically; Rare disorder may explain 11-year-old's sudden odd tics and moodiness; Why is PANDAS so controversial? Medical professionals are divided.

Thai cave rescuers say they expected some kids to die during the mission; Mission is a 'go': Rescuers jump into action to save boys from Thai cave.

A look back at the career, life and legacy of the "Queen of Soul".

John McCain, a devout maverick, dies at 81; John McCain on the horrors he endured as a POW; John McCain's colleagues, friends reflect on his legacy.

This summer the world watched in awe as a treacherous mission was staged to save 12 boys and their soccer coach from a flooded cave in Thailand. Now that the team is safe, a special edition of "20/20" features ABC News foreign correspondent James Longman's exclusive interview with the boys and the coach, Ekkapol Chantawong, known as Ek. The boys open up about previously unknown details including the excitement they felt when they first entered the cave, their time studying at a Buddhist temple after the rescue, and their enthusiasm and dreams for the future – including one boy who says he wants to become a Navy SEAL. Coach Ek sheds new light and details on the moment he first realized they were trapped, how he kept the boys calm in the cave and how grateful he is that they are all alive.

In October 2013, 14-year-old Abby Hernandez disappeared on her way home from school without a trace. Nine months later, the New Hampshire teen returned home with a harrowing story of kidnapping, captivity and unspeakable abuse. Mostly silent for nearly five years since she disappeared, Abby tells her story for the first time to ABC News correspondent Deborah Roberts. She opens up about the difficult details of her abduction including being held for months in captivity by Nathaniel Kibby, who forced her to wear a shock collar and kept her prisoner inside a shipping container; and the psychological strategies she had to deploy in order to stay alive, including bonding with Kibby. Abby discusses her life now and how it has changed since her captivity.

A high school cheerleader and football player's tumultuous relationship; Teen found dead in her bed from a gunshot to her head; Today, convicted killer apologizes for shooting ex-girlfriend.

Interview with Elizabeth Thomas, who was taken at age 15 by her Tennessee high school teacher, resulting in a 38-day nationwide manhunt.

Stories of Americans who followed their dreams and started new careers later in life, including a woman who quit her finance job to pursue acting, and a woman who became the oldest person to graduate the from the Houston Police Academy.

Audio detailing the night Prince nearly died from overdose on plane; Prince suddenly dies at Paisley Park from fentanyl overdose.

Teacher's gruesome 1992 death launches decades-long mystery; Pennsylvania teacher's 1992 death grows cold.

An exclusive sit-down interview with first lady Melania Trump.

11-year-old arrested for his pregnant soon-to-be stepmother's murder: Why police believe ex-boyfriend was not connected to woman's murder; What it's like to be 11 years old and accused of murder.

A $3.5 million mansion, a beautiful family's future up in flames; Closing in on the brutal killer in DC mansion murders; Friends, family testify against suspect at trial for DC mansion murders.

Former hockey star's young family shattered by wife's murder at home; Manhunt begins for brutal killer of mother of two; 7-year-old daughter becomes key eyewitness in attack on mom.

Former first lady Michelle Obama talks about her new memoir, ``Becoming.''

26-year-old face transplant recipient: 'I see me'; Face transplant recipient's mom learns about renowned reconstructive surgeon.

Texas couple's wedding anniversary celebration ends in tragedy; Woman discovered tied up in a closet, husband stabbed, beaten to death; Woman's family believes husband's killer is still out there

Looking back at the legacy of a president.

Chris and Shanann Watts' seemed to be in love, say friends, family; In a shocking statement, Chris Watts describes how he killed his wife; Shanann Watts and her two daughters are found dead.

Chris and Shanann Watts' seemed to be in love, say friends, family; In a shocking statement, Chris Watts describes how he killed his wife; Shanann Watts and her two daughters are found dead.