Nottingham prison has been highlighted by The Howard League for Penal Reform has for its overcrowding problem.
The charity says financial cuts mean that prisoners were forced to share cells not designed for multiple people.
The charity also says prisoners are kept locked up for up to twenty two hours a day and that this is the reason for violence and self-injury in prisons.
More top news
Despite receiving treatment at the scene, the man was pronounced dead shortly after.
Cloud will largely clear this evening, although with variable cover and few light showers over the Derbyshire hills.
The rain will clear during the evening so the rest of the night will be dry and mild with long clear periods.