World's Most Evil Prisoners

Covered in tattoos, Jaime Osuna is one of the most feared men in the U.S. prison system.

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

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

At 18, Christa Pike commits a murder and becomes one of the youngest ever women sent to death row.

Edward Johnson was sent to prison for the brutal murder of a female friend.

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

His time behind bars only made Italian-American mobster Freddy Geas even more brutal.

James Robertson is considered one of the most volatile, dangerous men in the U.S. prison system.

Gary Vinter, in prison for double murder, stabs an inmate in the eye and gives another brain damage.

James "Porky" O'Rourke is one of the most feared men in the U.K. prison system.