A look at Lou Pearlman, former manager of *NSYNC, Backstreet Boys, and O-Town, and his past that includes ponzi schemes and swindling investors and banks out of hundreds of millions of dollars.

Thirty years after she learned she was switched at birth, Kimberly Mays reveals details about her tough childhood and her struggle with her identity.

Beth Holloway takes her first extensive trip back to Aruba in nearly ten years after her daughter, Natalee Holloway, disappeared while on vacation there almost 15 years ago.

When a University of Illinois scholar goes missing, a suspect's girlfriend works with the FBI to go under cover and secretly record a conversation that ultimately cracks the case.

Mary Jo Buttafuoco, Joey Buttafuoco and their daughter Jessie reflect on their lives following Mary Jo's shooting in 1992.

A man is convicted of killing his 8-month-pregnant wife; a tip points to another suspect.

Payton Leutner speaks out for the first time after two friends stabbed her and left her for dead in the woods of Waukesha, Wis., to prove themselves to a fictitious character known as "Slender Man."

Dorothy Stratten's life and promising career are cut short when her estranged husband kills her.

Dan Markel and Wendi Adelson's marriage falls apart in Florida; FBI tries to get more information on Markel's murder; Where Dan Markel murder case stands today.

Daughter of Kansas woman who went missing found alive 15 years later; John Robinson, the conman; John Robinson goes to trial for three murders in Kansas.

Performers Siegfried Fischbacher and Roy Horn open up about the infamous career-ending tiger attack.

Detectives use DNA evidence to solve a cold case involving the murder of an 18-year-old woman.

A lifelong hustler discovers the strip club scene; Strip club workers' new hustle takes a dark turn; Doctor almost swindled out of $100,000 after three dates with woman.

When a woman secretly records her husband's affair, she snaps and kills his girlfriend and herself.

How did an ordinary-looking American family turn into pistol-wielding bank robbers?

Trump on polls showing Biden ahead: 'I don't believe those polls; Trump on Mueller, immigration and putting his personal touch on Oval Office

When a woman is found unresponsive in her bathtub, two of her daughters suspect their father is responsible.

Daniel Wozniak was a community theater actor in California when he was arrested for the murders of Sam Herr, a war veteran, and Julie Kibuishi, a college student and dancer, in May 2010.

Revisiting the 1989 case of a female jogger who was brutally raped and beaten in New York City.

A man convicted of murder has his conviction overturned by an appeals court and waits to see if a higher court agrees it should be overturned.

A mother on death row for the unthinkable. Now the court orders testing on crucial crime scene evidence.

A woman discovers her biological father is actually her mother's former fertility doctor.

Rebecca Schaeffer is shot point blank at the door of her Los Angeles home by her longtime stalker.

A 21-year-old Miami hotel guest has no memory of being attacked, raped and left for dead.

A man convicted of killing his pregnant wife is set free after less than eight years in prison.

A woman shoots her three young children, seriously injuring two and killing one.

The rise and fall of Silicon Valley star Elizabeth Holmes and her technology company Theranos.

Dr. Joseph Sonnier met his girlfriend Richelle Shetina at a dance class, and the two traveled to Paris together, just weeks before the unthinkable happened.

When 19-year-old Sarah Stern's car is mysteriously found on a New Jersey bridge, a former classmate comes forward with information that helps authorities discover what happened.

A man terrorizes the city of Kalamazoo, Mich., for eight hours on Feb. 20, 2016.

Insight into serial killer Ted Bundy's vicious past and crimes, featuring new interviews with key players, including surviving victims and those who were instrumental in helping place him behind bars.

A New York woman convicted of murdering her second husband and attempting to murder her daughter.

After "BTK" serial killer Dennis Rader's shocking confession, his daughter had to find ways to cope with her new, shattered reality.

A look into the past of Cary Stayner, who terrorized Yosemite National Park in 1999, murdering four women; interviews with former FBI agents Jeff Rinek and John Boles; an interview with one of Stayner's original intended victims.

Televangelists Jim and Tammy Faye Bakker's religious empire and the sex and financial fraud scandals that engulfed it.

In a case that remains shrouded in mystery, actor Robert Blake speaks to "20/20" thirteen years after he was acquitted in his wife's murder.

A look back at the notorious Bobbitt case from 1993; interviews with John Wayne Bobbitt, Lorena Bobbitt and others close to the case.