New theories emerge in the O.J. Simpson case, including a serial killer's confession, a possible hit man who claims responsibility for the murders.

Uncovering Prince's secret struggles from his earlier years to the final days leading up to his shocking death.

Examining the factors that led to the crash that killed John F. Kennedy Jr. and a never before seen interview with a person who may have been the last person to speak to JFK Jr, moments before the crash.

A look at new details surrounding Whitney Houston's last days and her tumultuous relationship with Bobby Brown.

HLN highlights the shocking motive that turned these brothers into killers.

Lyle Menendez speaks from behind bars to Chris Cuomo, more than 25 years after he and his brother Erik were convicted of first degree murder.

New theories emerge in the O.J. Simpson case, including a serial killer's confession, a possible hit man who claims responsibility for the murders.

On February 21, 2001, a beautiful young woman is viciously murdered inside her Hollywood home just before she was scheduled to go on a date with actor Ashton Kutcher. As detectives search for answers, her friends relay stories about a strange air conditioning repairman who would show up uninvited at her home. They only know him as "Mike," but as the investigation unfolds, police discover that his full name is Michael Thomas Gargiulo, and he may be linked to another murder almost eight years earlier in Illinois. While a suspect and not yet arrested, Gargiulo commits more brutal crimes, only to be stopped by one young woman who fights back and survives.

May 2001 in Washington DC, 24 year old intern Chandra Levy vanishes into thin air. Police find her keys and her cell phone in her apartment and no sign of a struggle. Who saw her last? Where did she go?

An eight-month-old baby is fatally injured while in the care of a family's au pair, Louise Woodward. Was it child abuse or a tragic accident? Doctors suspect the former, a case of 'shaken impact syndrome,' and detectives arrest the infant's 19-year-old British nanny who cared for him in the hours and minutes before his demise. But, was the baby's death a case of intentional murder or a tragic accident that occurred under Woodward's watch?

Revelations of what Michael Jackson's children and staff witnessed prior to his death and an investigation into the claims that Jackson took his own life.

The aftermath of the investigation into the murder of JonBenet Ramsey.

Examining the factors that led to the crash that killed John F. Kennedy Jr. and a never before seen interview with a person who may have been the last person to speak to JFK Jr, moments before the crash.

The chilling account of a man who survived his encounter with the notorious serial killer, who managed to evade police scrutiny for years.

David Kaczynski, the brother of convicted Unabomber Ted Kaczynski, discusses the hunt that led to the capture of his infamous sibling.

Heath Ledger's death is examined.

Deborah Jean Palfrey threatened to expose names on her client list and was found hanging on her mother's property.

In 2008, two-year-old Florida toddler, Caylee Anthony, vanishes. Her mother, Casey Anthony tells investigators Caylee has been kidnapped by her nanny, a woman Casey's family has never actually seen. But why?

In 2008, two-year-old Florida toddler, Caylee Anthony, vanishes. Her mother, Casey Anthony tells investigators Caylee has been kidnapped by her nanny, a woman Casey's family has never actually seen. But why?

An investigation into the murder of fashion designer Gianni Versace, who was gunned down in broad daylight on the steps of his Miami Beach mansion by Andrew Cunanan in 1997.

In the mid-1970s, hundreds of people began disappearing without a trace. Families were left wondering about their loved ones for decades until shocking news about a mysterious religious group made headlines around the world.

George Michael's life as an international superstar comes to a mysterious and tragic end on Christmas Eve 2016. Family and fans are shocked by his sudden death. There are so many unanswered questions. Who was with Michael in those final hours? What happened the night he died? What did the coroner find was the actual cause of death?

It was the shocking affair that nearly toppled a Presidency. Bill Clinton and a 21 year old White House intern, Monica Lewinsky.

It was the shocking affair that nearly toppled a Presidency. Bill Clinton and a 21 year old White House intern, Monica Lewinsky.

A tale of murder, adultery, courtroom drama, and ultimately the death penalty. The story of Scott and Laci Peterson as told by those who lived it. Did Scott Peterson murder Laci?