
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.

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.