Son of Sam: The Duke of Death, Part 1

He is among the most-infamous killers in US history. From 1976 to 1977, David Berkowitz terrorizes New York City under his self-given moniker: the Son of Sam.

Son of Sam: I Am a Monster, Part 2

In 1977, New Yorkers are being stalked by a seemingly faceless serial killer known as Son of Sam, but a twist of fate and a little luck lead to his capture.

BTK: Bind, Torture, Kill Part 1

Dennis Rader, the self-proclaimed BTK serial killer, terrorizes Wichita, Kansas, for decades. Residents of the area are petrified that they will be next.

BTK: The Taunting, Part 2

The BTK killer spends years playing a cat-and-mouse game with law enforcement, taunting authorities to catch him, before he finally makes a critical mistake.

The Night Stalker: Summer of Terror, Part 1

A serial killer terrorizes Los Angeles during one of the city's hottest summers on record. His crimes are random, vicious and committed in the name of Satan.

The Night Stalker: I Will Be Avenged, Part 2

A tip from a teenager helps authorities identify the Night Stalker as Richard Ramirez. After they release his photo, Ramirez is nearly killed by a mob.

The Co-ed Killer: The Murder Capital of the World, Part 1

For years, residents of Santa Cruz, California, live in fear of a man dubbed The Co-ed Killer, a name given because several of his victims are college students.

The Co-ed Killer: Thinking Murder All Day Long, Part 2

By April 1973, twenty-four-year-old Edmund Kemper murders six college students and several members of his family before he is finally captured.

Robert Durst: World's Worst Fugitive, Part 1

The heir to a vast, million-dollar real estate fortune is linked to the deaths of his wife, his best friend and his neighbor.

Robert Durst: Nobody Tells the Whole Truth, Part 2

Six weeks after jumping bail in Galveston, Texas, Robert Durst is caught on a store security camera in Pennsylvania shoplifting a sandwich.

Dr. Death: A License to Kill, Part 1

For nearly two decades, a distinguished Marine and trusted doctor leaves a trail of death and mayhem across two continents.

Dr. Death: You're Next, Part 2

Dr. Michael Swango took an oath to "do no harm," but suspicious illnesses and deaths follow this once-trusted physician from hospital to hospital.

The Golden State Killer: Hunting Human Beings, Part 1

The Golden State Killer commits 13 murders and more than 50 rapes during his decades-long reign of terror. Investigators struggle to both uncover his identity and determine how he's roamed free for so long.

The Golden State Killer: Hiding in Plain Sight, Part 2

After nearly 50 years without an arrest, a new forensic technique brings a major break in the case that finally reveals the Golden State Killer's identity.

The Butcher Baker: Terror in the Wilderness, Part 1

One of the most-infamous rapists and serial killers in Alaska's history, the Butcher Baker kidnaps young women and brings them into the wilderness to hunt them like prey for more than a decade.

The Butcher Baker: The Girls Who Got Away, Part 2

In a shocking confession, serial killer Robert Hansen describes how he lured in his victims to commit 17 murders and more than 30 rapes.

The Amityville Horror: Murdered One by One, Part 1

In 1974, six members of the DeFeo family are found murdered inside their seaside home. The horrific crime will go on to inspire the legend of the Amityville horror.

The Amityville Horror: Evil in the House, Part 2

In search of answers to the Amityville murders, para-psychologists and psychics descend on the infamous house to investigate strange and unusual claims.

The Dating Game Killer: Smooth Talker, Part 1

In 1968, a serial killer abducts, rapes and leaves an eight-year-old girl for dead. She survives the attack, but the suspect evades police to continue his murder spree.

The Dating Game Killer: The Bite Mark, Part 2

Rodney Alcala had already murdered at least five women when he appears on TV's The Dating Game and wins a date with a contestant. After being rejected by his new date, his killings continues.

The Iceman: The Murder Business, Part 1

Unbeknownst to his suburban neighbors, family man Richard Kuklinski is the cold-blooded killer and part-time hitman-for-hire known as the Iceman.

The Iceman: Trapping a Serial Killer, Part 2

Richard Kuklinski gets away with murder for years, and investigators have little evidence to tie him to his crimes. Then, detectives send in an undercover agent.

The Firestarter: A Wall of Flames, Part 1

A string of fires plagues California in the '80s and '90s, with one blaze killing four people. A respected fire captain is certain that an arsonist is on the loose.

The Firestarter: Chasing a Pyromaniac, Part 2

In a race against time, investigators hunt for an arsonist setting devastating fires across California. To their complete shock, the man responsible turns out to be none other than a renowned fire investigator.

The Ken and Barbie Killers: Dead Ringer, Part 1

From 1987 to 1992, Ontario authorities join FBI profilers to hunt the monster responsible for a horrific spree of rapes, abductions and murders. For years, they come up empty handed, until one tip leads cops to an unlikely suspect.

The Ken and Barbie Killers: I Kidnapped a Girl, Part 2

After finding the prime suspect in a spree of rapes and murders, the Ontario authorities uncover disturbing videotapes that reveal who else was involved in his crimes. When the public learns the sordid details, shockwaves are sent throughout the world.

The Back to School Killer: A Fear in the Air, Part 1

When college-aged women in Charlottesville, Virginia, start disappearing, the community is shaken to its core. The search for answers lead authorities to an unlikely suspect, a local star athlete named Jesse Matthew Jr.

The Back to School Killer: Portrait of a Predator, Part 2

In a shocking story, investigators discover that Jesse Matthew Jr. kidnapped and killed at least two women, while a third cheats death to become the key witness that brings a murderer to justice.

Sammy "The Bull" Gravano: He Makes Money and Murders People, Part 1

Sammy "The Bull" Gravano carries out multiple murders for mafia kingpin, John Gotti. After his arrest, he breaks the sacred oath of silence and cuts a deal with the government to testify against his former boss.

Sammy "The Bull" Gravano: They Made a Deal with the Devil Part, 2

As the highest-ranking mobster ever to defect, Sammy Gravano describes the shocking murders of close friends and business partners as well as the secret world of La Cosa Nostra. Despite the bounty on his head, Gravano then returns to the criminal world.

The Hillside Stranglers: A Pair of Serial Killers, Part 1

In the fall of 1977, bodies of young women begin piling up on the hillsides of Los Angeles. Almost all of the victims are nude and show signs of torture, and overnight the city becomes gripped with terror over The Hillside Strangler.

The Hillside Stranglers: She Walked into the Trap, Part 2

As the Los Angeles hillside killings escalate, police receive reports of two suspicious men flashing police badges and asking women to pull over. Suddenly, detectives realize that they're facing not a single serial killer, but a pair working in tandem.

The Cross Country Killer: He Could Make People Disappear, Part 1

Samantha Koenig is closing shop in Anchorage, Alaska, when a man known in the community as a business owner and caring father approaches her. After her kidnapping, an intense manhunt takes authorities on a cross-country investigation.

The Cross Country Killer: The Kill Kits, Part 2

After his capture in a nationwide manhunt, Israel Keyes plays cat and mouse with detectives, revealing some details about his crimes and his missing victims. In the end, Keyes had one last surprise for investigators.

John Gotti: It Was Kill or Be Killed, Part 1

John Gotti's expensive suits and swagger earned him the nickname Dapper Don, but in reality, he is a man to be feared. A ruthless and dangerous mafia gangster, John Gotti orders hits on his enemies, his friends and anyone who dares to cross him.

John Gotti: There Were Fatal Consequences, Part 2

In 1985, John Gotti makes a big move when he organizes the murder of the Gambino boss Paul Castellano and takes the throne as the new godfather. Everyone from law enforcement to other goodfellas considered Gotti dangerous, unpredictable and unstoppable.

The Trailside Killer: Part One

It's the late 70s, and a baffling mystery plagues Northern California's popular hiking trails -- a serial rapist and murderer dubbed the “Trailside Killer” terrorizes the area. Investigators find few clues -- until one brave victim manages to get away.

The Trailside Killer: Part Two

It's the late 70s, and a baffling mystery plagues Northern California's popular hiking trails -- a serial rapist and murderer dubbed the "Trailside Killer" terrorizes the area. Investigators find few clues -- until one brave victim manages to get away.

The Slave Master: Part One

In the mid-'80s, Kansas City women start to vanish. They all share one thing in common -- an odd connection to the same cunning man who calls himself "The Slave Master." Police must be just as wily if they want to bring down this serial killing sadist.

The Slave Master: Part Two

In the mid-'80s, Kansas City women start to vanish. They all share one thing in common -- an odd connection to the same cunning man who calls himself "The Slave Master." Police must be just as wily if they want to bring down this serial killing sadist.

The Twin: Part One

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

The Twin: Part Two

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

The Times Square Killer: Part One

New York City firefighters discover the headless bodies of two sex workers, leading the tabloids to dub the perpetrator the “Times Square Killer.” Now, investigators must find a way to hunt down a psychopath adept at blending into his surroundings.

The Times Square Killer: Part Two

New York City firefighters discover the headless bodies of two sex workers, leading the tabloids to dub the perpetrator the "Times Square Killer." Now, investigators must find a way to hunt down a psychopath adept at blending into his surroundings.

The Black Widow: Part One

Nurse Judy Buenoano survives a string of unimaginable tragedies, including two house fires, a mysterious canoe accident and the loss of her husband, boyfriend, and child. Is Judy just a magnet for bad luck, or is something far more sinister at play?

The Black Widow: Part Two

Nurse Judy Buenoano survives a string of unimaginable tragedies, including two house fires, a mysterious canoe accident and the loss of her husband, boyfriend, and child. Is Judy just a magnet for bad luck, or is something far more sinister at play?

The Happy Face Killer: Part One

The murder of Taunja Bennett is the first of many bodies found in the Pacific Northwest, California, and beyond. Police never link the deaths until someone starts sending macabre letters signed with a happy face. Is this the end -- or just the beginning?

The Happy Face Killer: Part Two

The murder of Taunja Bennett is the first of many bodies found in the Pacific Northwest, California, and beyond. Police never link the deaths until someone starts sending macabre letters signed with a happy face. Is this the end -- or just the beginning?