20/20 - Season 19 / Year 2021

In the 1970s, 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 JonBenét Ramsey; the video diaries of legendary detective Lou Smit, who was brought out of retirement to investigate the murder of the child beauty queen.

A man who claims to have killed his wife while sleepwalking opens up about the incident, his children and his life in prison.

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.

Tonight ABC News presents a live "20/20" primetime special on the aftermath of the Atlanta mass shooting and the increase in anti-Asian American hate crimes around the country.

A young woman goes missing. There's no body, no murder weapon, no crime scene. Now, follow one mother's crusade for justice in this true crime investigation.

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 left five Florida college students dead over four days.

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

An intimate portrait of George Floyd's life on the heels of Derek Chauvin's murder conviction.

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

Eighteen years after his pregnant wife's murder, could Scott Peterson receive a new trial?

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.

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.

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

Three young women were murdered on Stanford university's campus within two years of each other. For nearly 50 years, the mystery remained unsolved until DNA technology finally linked the killers.

A millionaire, an ex-NFL player and a mom become a deadly love triangle. Nanette Packard and Eric Naposki are serving time for the murder of her fiancé Bill McLaughlin.

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.

Behind the glitz and glam of one of the sexiest shows in entertainment, an FBI investigation revealed Chippendales founder Steve Banerjee was the mastermind behind multiple murder-for-hire plots.

Joe Bryan, a former principal in Clifton, Texas, was convicted of murdering his wife Mickey Bryan in 1985, a crime he maintains he didn't commit. Was it connected to another murder in the small town?

The first wife of a "Jekyll and Hyde" Manhattan plastic surgeon mysteriously disappears. More than 30 years later, Robert Bierenbaum confesses to her murder.  John Quinones investigates.

Why the Petito case went viral and the outcry for the same attention to be applied to the cold cases of others, especially people of color and indigenous women.

Before serial killer Keith Hunter Jesperson, known by his nickname "Happy Face Killer," turned himself in in 1995, authorities believed Laverne Pavlinac and her boyfriend murdered his first victim.

Julie Rea was in prison for her 10-year-old son's murder until a "20/20" viewer helped crack open the case, leading to a serial killer confessing to the crime. One of his attack survivors speaks out.

Diane Sawyer's exclusive with the Turpin children who escaped parents' house of horror.

Arbery's mother Wanda Cooper Jones discusses her mission to find truth and justice after the tragedy that changed their lives forever.

The shooting tragedy on the 'Rust' movie set – what really happened? Now, hear breaking new interviews from crew members who were there, the Sheriff, the DA, and the father of the armorer.