A psychologist relays BTK's own story about how he became a killer.

Detectives share some of BTK's own meticulous documentation of his crimes.

A victim's son receives disturbing letters from a mysterious author.

An investigative journalist had his own theory about the Son of Sam.

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Authorities examine writing samples that John and Patsy Ramsey submitted at the beginning of the JonBenét investigation. Expert Cina Wong ruled out John as the ransom note writer, but found similarities between Patsy's writing and the ransom note.

Police question the Ramseys' inner circle and learn that bed-wetting was an issue for JonBenét. They then envision an alleged theory with Patsy Ramsey as the killer- covering up a tragic accident and staging the murder scene.

A young couple, The Stuarts, are robbed and shot in Boston. Carol and her unborn child are killed. Charles survives to describe their black assailant, inflaming racial tensions, until a surprise witness comes forward with a story that blows open the case.

When Long Island newlywed Lisa Solomon disappears on Christmas Eve, family and friends search for her relentlessly. Did she leave her husband of two months in the middle of the night? Or is there something more sinister at play?

After he clashes with co-workers, Tom Monfils mysteriously disappears on the job at a Green Bay paper mill. Soon enough it looks like murder, but no one is talking to detectives. Is it a conspiracy of silence, or a tragic miscarriage of justice?

Beautiful teenager Jennifer Levin is found strangled to death in Central Park. A prep school heartthrob, Robert Chambers, is arrested for the crime. The press seizes on his provocative claim that Jennifer’s death happened accidently during “rough sex.”

Lisl Auman's life is turned upside down when her so-called 'friends' reveal their dark and dangerous sides.

In the summer of 1997, Lisl Auman is charged with the felony murder of Denver police officer Bruce VanderJagt, despite being locked in the back of a police patroller when the deadly shots were fired.

Two young women are raped in Darien, Connecticut. The attacker threatens to kill them if they tell anyone. When police announce that the serial rapist is a popular high school athlete from a prominent family, the story makes front-page news.

Mark Seal, Contributing Editor for 'Vanity Fair' talks about working with Hunter S. Thompson as well as why he thinks the Lisl Auman case was such an important story to tell.

Journalist Barbara Nevins Taylor explains how she went undercover with a hidden camera.