Notorious snitch Paul Skaink served as a witness in a total of 35 Florida cases, helping to send dozens to jail, including four to death row; the controversial use of jailhouse informants.

A killer terrorizes idyllic California neighborhoods in the 1970s and 1980s, evading authorities as he lives among his victims, for over four decades.

ABC News announced today a primetime special on the life and legacy of Alex Trebek, the iconic television host of "Jeopardy!" The one-hour special profiles the beloved television star, who was the host of the longest-running quiz show in the U.S. In interviews over the past year with "Good Morning America" co-anchor Michael Strahan and "GMA3: What You Need To Know" co-Anchor T.J. Holmes, Trebek spoke candidly about living with cancer and the lessons he's learned. He talked about what he hoped his last days would be like and how grateful he was that he had a chance to discover all the love his viewers held for him as he confronted stage 4 pancreatic cancer. Prior to his passing, Strahan had a rare interview with Jean Trebek, Alex's wife of more than 30 years, in which she talked about dealing with her husband's illness and what it taught each of them. The special includes "Good Morning America" co-anchor Robin Roberts' interview with Trebek when he first revealed his diagnosis and decided to help bring awareness to symptoms of the illness. In interviews before his death, Trebek's co-workers reflect on his persistence, strength and his respect for his fans. The hour includes a behind-the-scenes look at "Jeopardy!" through Trebek's eyes and rare footage of his early start on television. "Alex Trebek, Remembered: A '20/20' Special" hosted by ABC News' Chris Connelly airs Sunday, Nov. 8 (10:00-11:00 p.m. EST), on ABC. "20/20" is anchored by David Muir and Amy Robach. David Sloan is senior executive producer. Terri Lichstein is senior broadcast producer. Ann Reynolds is senior producer, and Alison Lynn and Tami Sheheri are producers of this special.

A wife and mother vanishes, without a trace, from her Utah home; featuring interviews with family, friends, and law enforcement.

An investigative "20/20" by ABC News and Louisville's Courier Journal takes a deep dive into the evidence in the Breonna Taylor case and searches for answers from the night that claimed her life.

On the heels of Boeing 737 MAX's recent clearance to fly again, Bob Woodruff reports on the aircraft's controversial flight control software and how it mistakenly sent planes into deadly nosedives.

A woman's seemingly obsessive and threatening messages to an ex precede a stunning twist.

Rodney Reed attempts to clear his name and overturn his conviction for a 1996 murder.

In the 1970's, a notorious serial killer makes a winning appearance, as a contestant on a popular dating show, in the midst of his killing spree.

New insight into the murder of JonBenet Ramsey; the video diaries of legendary detective Lou Smit, who was brought out of retirement to investigate the murder of the child beauty queen

In a new interview with "20/20," Scott Falater, whose sleepwalking defense made national headlines in the '90s, says he still doesn't know what happened the night he murdered his wife.

On the anniversary of Anna Nicole Smith's death, her daughter visits the most influential places in her mother's life.

A world-renowned surgeon is caught in a web of lies and deceit by his fiancée.

Margaret Rudin discusses her desire to prove her innocence in the murder of her husband.

Investigation into the past of Lori Vallow, whose two missing children were later found dead.

A true crime love triangle mystery. Now for the first time, an exclusive interview with the accused wife, the day before she was to take the stand.

Angie Dodge was murdered in 1996 and the wrong man served 20 years in prison for the crime. Her mother never stopped investigating and helped catch the true killer in 2019.

A special edition of "20/20" looks into the shootings in Georgia and the rise in hate crimes against the Asian American Pacific Islander community.

A courageous mother, whose daughter mysteriously went missing, finds justice with the help of another mom she never met.

In a new interview, convicted murderer Lyle Menendez speaks out from prison following Menendez Brothers’ newfound TikTok fame.

The search for a killer, whose reign of terror, over four days, left five Florida college students dead.

A family discusses their seemingly perfect husband and father's deadly secret.

An intimate portrait of George Floyd's life, following Derek Chauvin's murder conviction.

Eighteen years after being convicted of his pregnant wife's murder, Scott Peterson may receive a new trial.

David Muir reports: New interviews reveal shocking info on a botched murder investigation into who killed Riley Fox.

New details are revealed in the case of a missing Colorado mom who secretly ran an expensive escort business.

The couple at the center of the so-called “Gone Girl” kidnapping case reveal new details to Amy Robach.

What happened to Fort Hood soldier Vanessa Guillen? "20/20" features the first TV interview with her fiancé.

An inside look at the life of socialite Ghislaine Maxwell, Jeffrey Epstein's alleged co-conspirator

David Muir speaks with survivors and spends time with families who lost loved ones 20 years after the attacks.

20 years after so many young mothers lost their husbands, Diane Sawyer brings nearly 40 families back together to share stories about their resiliency and hope.

At just 23-years-old, Amanda Gorman became an overnight star after her performance at the 2021 Presidential Inauguration of her renowned poem, "The Hill We Climb." Since then, she hasn't slowed down.

DNA evidence links two former Stanford University employees to the 1973 murders of Arlis Perry, Leslie Perlov, and Janet Ann Taylor, featuring an interview with the family of one of the convicted killers

A prison interview with Nanette Packard, who is at the center of a deadly love triangle with wealthy businessman Bill McLaughlin and former NFL player Eric Naposki.

Anna Sorokin, known as the "Soho Grifter," conned the highest social circles into believing she was a German heiress worth millions, featuring an interview with Sorokin following her release from prison.