Covered in tattoos, his terrifying appearance makes Jaime Osuna a feared man in the U.S. prison system; awaiting trial, he begins practicing Satanism and attempts to kill a fellow inmate.

While on trial for rape, 33-year-old Brian Nichols goes on a violent rampage that results in three murders.

The story of Tyler Davis Bingham, pretty criminal turned leader of the brutal and feared Aryan Brotherhood.

Mark Hobson is a man with an extreme propensity for violence, a notorious British spree killer who bludgeoned to death his girlfriend then seven days later sexually assaulted and killed her twin sister.

Edward Johnson was sent to prison for the brutal murder of a female friend, but the violence didn't end there.

One of the UK's most infamous serial killers, Joanna Dennehy brutally stabbed three men to death.