Sent to prison after the torture and violent murder of a mother of six, Jamie Osuna is now awaiting trial.

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.

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

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

Being 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 a fellow inmate in the eye and gives another brain damage.

James 'Porky' O'Rourke's addiction to violence means he is one of the most feared men in the UK prison system.

Craig Bjork, who killed two women and both of his children, remains a dangerous threat — even behind bars.

Whilst being transported on a bus, Ricky Dubose killed two correctional officers before going on the run.

Jesse Con-ui's loyalty to the New Mexican Mafia drove him to betray and murder his former mentor.

One of the most feared men in US prison history, Thomas Silverstein became a gang leader for the Aryan Brotherhood on the inside. After savagely killing multiple inmates and a correctional officer, he spent 36 years in solitary confinement.

Having committed over 27 assaults in prison, Billy Tracy is one of the most violent offenders on death row.

Career criminal Michael Dutcher has continued his streak of violence and murder even behind bars.

Imprisoned for murdering a woman and her teenaged son, Denver Simmons only caused more violence behind bars.

Feared Aryan Warriors gang leader 'Mugsy' Williams was a one-man crimewave — even behind bars.