I Am Strange

The Good Girl

Do Her Mortal Harm

I Killed Him. Boom. Boom.

You Met the Angel of Death

I'm Just a Sick Monster

She Isn't Acting Dead Enough

Season 3

Masters of Manipulation

Documentary

Crime

Signs of a Psychopath

Investigation Discovery

Season 1

Season 2

Season 4

Season 5

Season 6

Season 7

Season 8

Season 9

This harrowing half-hour archive series revisits some of the most brutal killers in modern history, reviewing news footage and the words of the killers themselves to see which terrifying traits each killer exhibited. What are the signs...of evil?