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Britain's longest serving prisoner has vowed to kill again if he's let out of solitary confinement.
In a letter to his nephew, serial killer Robert Maudsley revealed he is now happy and content in solitary confinement, warning he'll kill again if he is ever released.
The killer's nephew Gavin made the new claims in a new Channel 5 documentary, HMP Wakefield: Evil Behind Bars, according to The Mirror.
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Maudsley has been caged in a glass prison cell since 1979 after receiving a 47-year sentence for murdering four men in a wave of vigilante justice, with three of the slayings occurring in prison.
He was originally convicted of murdering John Farrell in 1974 after the victim allegedly showed him sexually explicit content containing children.
Once he was sent to jail, Maudsley and another prisoner tortured and killed child molester David Francis in Broadmoor Hospital in 1977.
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He also killed two inmates at HMP Wakefield after he was sent there.
Salney Darwood, who was serving life for the manslaughter of his wife, and William Roberts, who was serving seven years for the sexual assault of a seven-year-old girl, were killed in Maudsley vigilante rampage.
Now 68, the serial killer remains in Wakefield and is kept in solitary confinement for 23-hours every day in a specially built cell.
He previously requested to keep a pet in his prison cell to keep him company, promising he wouldn't eat it.
Maudsley has also requested to have a TV so that he could learn about the outside world.
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Alternatively, he asked to be given a single cyanide pill with which to end his own life.
He wrote: "As a consequence of my current treatment and confinement, I feel that all I have to look forward to is indeed psychological breakdown, mental illness and probable suicide.
"Why can’t I have a budgie instead of flies, cockroaches and spiders which I currently have. I promise to love it and not eat it?
"Why can’t I have a television in my cell to see the world and learn? Why can’t I have any music tapes and listen to beautiful classical music?
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"If the Prison Service says no then I ask for a simple cyanide capsule which I shall willingly take and the problem of Robert John Maudsley can easily and swiftly be resolved."
Maudsley was the victim of horrific abuse as a child, both in a religious orphanage and at the hands of his parents.
On one occasion, he was kept in one room for six months, eerily similar to how he lives now.
During his trial, he claimed that he was thinking about his parents and how he should have killed them when he committed his crimes.
Featured Image Credit: Channel 5. Tetra Images / Alamy Stock PhotoTopics: True Crime, Crime, UK News