
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.

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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 one of the most feared men in the US prison system; he murdered his cellmate, attacked a prison employee and doesn't hold back from getting what he wants.

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