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An in-depth look at the terrifying offenders whose crimes earned them rare life sentences; despite being imprisoned, these inmates go on to torture, kidnap and even kill.
Craig Bjork's series of murders are described as one of the worst cases of mass murder that the city of Minneapolis has ever seen. After killing two women and both of his children, he remains a dangerous threat - even behind bars.
45 minutes
Nothing was going to stop Ricky Dubose from breaking free of prison. Whilst being transported on a bus between facilities, he killed two correctional officers before escaping - and going on the run.
45 minutes
Sadistic convict Leo Boatman is lethal on both sides of the bars. After the cold-blooded murder of two young campers in a Florida national park, he went on to kill three inmates, securing his place on death row.
45 minutes
Jesse Con-ui's loyalty to the New Mexican Mafia drove him to betray and murder his former mentor.
45 minutes
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.
45 minutes
Having committed over 27 assaults on correctional officers, Billy Tracy is one of the most violent offenders on death row.
44 minutes
Violent armed robber Michael Dutcher brutally murdered two people while attempting a prison escape. He remains a threat to anybody who stands in his way.
45 minutes
Denver Simmons is as dangerous as he is ruthless. Incarcerated for murdering a woman and her 14-year-old son, his violence only spiraled further once he was behind bars.
45 minutes
Remorseless murderer Casey Pigge's main ambition is to be the ultimate serial killer. If unrestrained, he remains a deadly threat.
44 minutes
Feared Aryan Warriors gang leader 'Mugsy' Williams was a one-man crimewave. His violence ultimately sparked a bloody showdown in a Nevada jail, leaving multiple inmates dead.
45 minutes
