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John Gotti's expensive suits and swagger earn him the nickname Dapper Don; in reality, he is a man to be feared, a ruthless, dangerous Mafia gangster who orders hits on his enemies, his friends, and anyone who crosses him.

Very Scary People

John Gotti: There Were Fatal Consequences Pt. 2

John Gotti: It Was Kill or Be Killed Pt. 1

While closing shop in Anchorage, Alaska, Samantha Koenig is approached by a man known in the community as a business owner and caring father who kidnaps her, triggering a manhunt.

The Cross Country Killer: The Kill Kits Pt. 2

The Cross Country Killer: He Could Make People Disappear Pt. 1

In the fall of 1977, bodies of young women begin piling up in Los Angeles; almost all of the victims are nude, discarded on hillsides, and show signs of torture; it is nearly a year before two murders 1,200 miles away uncover the Hillside Stranglers.

The Hillside Stranglers: She Walked Into the Trap Pt. 2

The Hillside Stranglers: A Pair of Serial Killers Pt. 1

Sammy the Bull Gravano was the right-hand man to mafia kingpin, John Gotti and carried out multiple murders; after his arrest, he breaks the sacred oath of silence and cuts a deal with the government, testifying against his former boss.

Sammy the Bull Gravano Pt. 2

Sammy the Bull Gravano Pt. 1

Investigation Discovery continues its heritage of providing in-depth, compelling documentaries & series that challenge viewers to think about key issues that shape our culture and define our world.

Investigation Discovery HD

Investigation Discovery

When college-aged women in Charlottesville, Va. go missing, the search for answers leads authorities to local star athlete Jesse Matthew Jr.; in a shocking story, two women are killed, but another survives to bring the murderer to justice.

The Back to School Killer: Portrait of a Predator Pt. 2

The Back to School Killer: A Fear in the Air Pt. 1

From 1987 to 1992, rapes, abductions and murders of young women occur north of the U.S.-Canadian border; a tip leads cops to an unlikely suspect: a blond, blue-eyed accountant who lives with his wife in a pink house in the suburbs.

The Ken and Barbie Killers: I Kidnapped a Girl Pt. 2

The Ken and Barbie Killers: Dead Ringer Pt. 1

Host Donnie Wahlberg chronicles the twisted lives of diabolical criminals, such as Charles Manson, Aileen Wuornos, John Wayne Gacy, the Rev. Jim Jones, and others.

S4 E10 | The Cross Country Killer: The Kill Kits Pt. 2

E12 | John Gotti: There Were Fatal Consequences Pt. 2

E11 | John Gotti: It Was Kill or Be Killed Pt. 1

E10 | The Cross Country Killer: The Kill Kits Pt. 2

E9 | The Cross Country Killer: He Could Make People Disappear Pt. 1

E8 | The Hillside Stranglers: She Walked Into the Trap Pt. 2

E7 | The Hillside Stranglers: A Pair of Serial Killers Pt. 1

E6 | Sammy the Bull Gravano Pt. 2

E5 | Sammy the Bull Gravano Pt. 1

E4 | The Back to School Killer: Portrait of a Predator Pt. 2

E3 | The Back to School Killer: A Fear in the Air Pt. 1

E2 | The Ken and Barbie Killers: I Kidnapped a Girl Pt. 2

E1 | The Ken and Barbie Killers: Dead Ringer Pt. 1