The Killer Speaks is an American documentary that features actual convicted felons as they describe their crimes step-by-step in chilling detail. It's a journey through the minds of killers, an autopsy of their psychology, with the goal of shedding light on what leads people to kill. The series includes spree killers, serial killers, and domestic violence killers.[1] The Killer Speaks casts killers from all over the country and not just from The First 48 series.