Starting in the late 1990s, a killer torments young women and his own family in the Pacific Northwest.

David Matusiewicz, Christine Belford, and their four children live the American Dream. But when David's parents move in, his family's need for control over the children leads to allegations of abuse, a 19-month kidnapping, and ultimately, a brutal murder.

This is the shocking and gruesome mystery of John Wayne Gacy, a popular Chicago businessman and part-time clown who was leading a double life in the 1970s. By day he was a community leader and by night a predator of young men.

In Chicago, community leader and part-time clown John Wayne Gacy leads a double life, transforming into a monster who preys on male teenagers and becomes the most prolific serial killer of his day.

The Zodiac Killer terrorizes Northern California in the late 1960s; he taunts the public with cryptic clues, threats of violence and ciphers that are supposed to lead to his identity, but mostly go nowhere.

The Zodiac Killer terrorizes Northern California in the late 1960s; he taunts the public with cryptic clues, threats of violence and ciphers that are supposed to lead to his identity, but mostly go nowhere.

More than 900 Americans died in an isolated jungle in northern Guyana in November 1978; Jim Jones has gone down in history as a madman who drove his followers to suicide, but the truth is more complicated and tragic than that.

He is among the most infamous serial killers in American history. From 1976 to 1977, David Berkowitz terrorized New York City – under his creepy self-given moniker: the Son of Sam. Using a large caliber. 44 revolver, he unleashed eight horrific shootings across three different boroughs- wounding seven people and killing six. Despite an extraordinary investigation, and hundreds of NYPD officers working the case– Berkowitz’s crime spree lasted over a year. How did he get away with it? What clues did investigators miss? The detectives who worked the case tell the true tale of what it was like in New York City with a gun-toting murderer on the loose.

In January 1974, four members of a family are brutally tortured and murdered in Wichita, Kansas. The murders shock the safe midwestern city, but little do they know, it is just the beginning. He calls himself “B.T.K.” which stands for Bind, Torture, Kill and for decades this bloodthirsty serial killer terrifies Wichita as he murders again and again and again. Wichita residents live in fear that they will be his next victim. Who is B.T.K. and will police capture this crazed killer before he strikes again?

B.T.K. stands for Bind, Torture, Kill., the name the serial killer gave himself. After terrorizing Wichita, Kansas with multiple killings from 1974-1991 he goes quiet. But he resurfaces in 2004 and residents of the midwestern city are once again petrified. For months he plays a cat and mouse game with law enforcement and the media taunting them as he seeks the attention he craves. But then… he makes a mistake. And when “BTK” is finally apprehended it is chilling to discover that he has been hiding in plain sight for years.

The summer of 1985 was one of the hottest Los Angeles had seen in a century. But terrified residents weren’t sleeping with the windows open, they weren’t sleeping at all. A killer was on the loose. And though the 1980s were considered the decade of the serial killer – one man stood out. He was the Night Stalker – his crimes were random, vicious and committed in the name of Satan. His victims ranged from toddlers to the elderly. And as the city was paralyzed with fear, he went unchecked while police struggled to stop him. Then the L.A.P.D. get a tip, a teenage boy spotted a suspicious car leaving a crime scene. Would it be enough to bring the Night Stalker to justice?

Through the record-breaking heat of the spring and summer of 1985 in California, a savage killer was on the loose. The Night Stalker had been linked to at least 15 murders from children to the elderly, male and female, wealthy and poor. Then police get a break – a tip from a teenage boy leads to the identity of the Night Stalker. Twenty-four hours later a mob of angry citizens track him down and capture him. But the man who terrified the nation for more than a year isn’t finished yet. His trial is a new, bizarre chapter that has some wondering if the Night Stalker will escape justice.

n April 1973, 24-year-old Edmund Kemper had murdered 6 coeds in and around the city of Santa Cruz, California, shaking the community to its core. But Kemper reached a breaking point, and what the public would soon learn, was almost impossible to believe. Told through interview footage with Kemper himself, as well as people who were there, this episode takes viewers inside the mind of a serial killer, from a childhood wrought with abuse through an early life of violence. Kemper outlines his motives for the killing spree and describes the terrifying methods he used to slaughter young women, operating right under everyone’s noses. As Kemper explains in great detail, he spared no one from his madness, not even his own flesh and blood. With his willingness to tell his story so openly, Kemper would go on, years later, to assist the FBI in profiling serial killers, offering insight into how, and why, killers like himself commit such horrific acts.

The Golden State Killer invaded homes, tortured and terrorized families, committed fifty brutal rapes and thirteen vicious murders, and was on the loose for forty-four years. Cold case Investigators chased down thousands of leads without ever getting their man. But a new forensic tool breaks the case and exposes this remorseless predator – Joseph DeAngelo – his family, his background, and his life story; and finally, scores of victims get a measure of long-awaited justice.

A killer stalks California; the clues are scarce, until one victim gets away.

A killer stalks California; the clues are scarce, until one victim gets away.

In the mid 1980s, Kansas City women start to vanish; they all share one thing in common, an odd connection to the same man who calls himself "The Slave Master"; police must be just as wily if they want to bring down this serial killing sadist.

Someone snatches a student from her college campus in Indiana, while a second missing girl turns up dead months later. When terrified girls report a man trying to lure them into his van, police wonder if he is the real killer until one man confesses.

Richard Francis Cottingham (born November 25, 1946) is a convicted serial killer and rapist who murdered at least eighteen young women and girls in New York and New Jersey between 1967 and 1980. He was nicknamed as: The New York Ripper, The Torso Killer and The Times Square Killer. Cottingham was arrested on May 22, 1980 and convicted of numerous murders. He was sentenced to multiple life sentences in prison. In 2009, decades after his first five murder convictions, Cottingham told a journalist that he had committed at least 80 to 100 "perfect murders" of women in various regions of the United States.

Keith Hunter Jesperson (born April 6, 1955) is a Canadian-American serial killer who murdered at least eight women in the United States during the early 1990s. He was known as the "Happy Face Killer" because he drew "smiley faces" on his numerous letters to the media and authorities. Many of his victims were sex workers and transients who had no personal connection to him. Strangulation was Jesperson's preferred method of murdering, the same method he often used to kill animals as a child. He was eventually arrested and convicted. He is serving multiple life sentences in prison, with no possibility of parole.

Keith Hunter Jesperson (born April 6, 1955) is a Canadian-American serial killer who murdered at least eight women in the United States during the early 1990s. He was known as the "Happy Face Killer" because he drew "smiley faces" on his numerous letters to the media and authorities. Many of his victims were sex workers and transients who had no personal connection to him. Strangulation was Jesperson's preferred method of murdering, the same method he often used to kill animals as a child. He was eventually arrested and convicted. He is serving multiple life sentences in prison, with no possibility of parole.

In mid-90s Miami, a crew of bodybuilders known as the Sun Gym Gang preys on the rich to rob them blind. As their greed grows, they turn to murder, resulting in one of the goriest crime scenes in Florida history.

In 1994 a violent serial killer hunts elderly women in a gated California community. A family member of the murderer realizes that the culprit is close to home, as the police hurry to stop her before she can kill again.

He was a family man, living in a New Jersey suburb with his wife and three kids. But unbeknownst to his neighbors, Richard Kuklinski held a dark secret: he was the "Iceman" – a cold-blooded killer who was part-time mob hitman for hire, and full-time psychopath. This intimidating, oversized killer managed to evade the police with ease for years. That is, until a few smart investigators started connecting the dots between seemingly unrelated murders and a mystery man known as "Big Rich."

He was a family man, living in a New Jersey suburb with his wife and three kids. But unbeknownst to his neighbors, Richard Kuklinski held a dark secret: he was the "Iceman" – a cold-blooded killer who was part-time mob hitman for hire, and full-time psychopath. This intimidating, oversized killer managed to evade the police with ease for years. That is, until a few smart investigators started connecting the dots between seemingly unrelated murders and a mystery man known as "Big Rich."