A pensioner serving a nine-month prison sentence for voyeurism died of "serious head trauma", a post mortem has revealed.
Serial peeping tom Alan Goode, aged 73, was found dead in his cell by prison staff at HMP Lincoln in the early hours of yesterday morning.
A 35-year-old inmate thought to have been sharing Goode's cell has been arrested and bailed over his death.
Goode was jailed in October after he was found lying on the floor of a women's toilet cubicle at a Leicester shopping centre.
Following a report into the safety standards at Lincoln Prison, the Chief Inspector of Prisons has said the report is "very concerning".
Mr Hardwick also said that inspectors would make a follow-up visit to the prison shortly and set out where and how improvements could be made.
A new report by Inspectors from Her Majesty's Inspectorate of Prisons (HMIP) has found 'serious failings' at the category B Lincoln jail, after inspectors arrived unannounced at the prison back in August.
During the visit, inspectors were told by prisoners that it was easy to get drugs and alcohol in the jail and there was clear evidence of inmates developing drug addictions while the instance of fighting and assaults was also high.
The prison was also criticised for the amount of time prisoners were kept locked in their cells.
A newly-built academy at the jail aimed at getting prisoners working was found to be almost empty, and prison staff were unable to say why this was the case.
Prison inspectors have produced a report into the safety standards of Lincoln jail, which was published just days after it was saved from the axe.
The authors of the report said staff morale was poor and prisoners' welfare was being place at risk. However, the report did acknowledge speculation over the prison's future which meant some of its problems were outside the prisons direct control.
The jail has been holding 50% more prisoners than it was certified to hold and the report also discovered that a foreign national prisoner has been incarcerated for nine years after the date his sentence originally ended.
Lincoln MP Karl McCartney says he has had talks with the Ministry of Justice about its ongoing review of the city's prison which could result in the site being closed or turned into an immigration removal centre.
He is urging those conducting the review to retain the prison in its current state.
The Prison Officers' Association says it hopes its members will be able to join forces with the other people campaigning to keep Lincoln Prison open following news that its future is under review.
Spokesperson Joe Simpson says at the moment they are just dealing with rumours about its future.
Lincoln MP Karl McCartney says he has had several discussions this week about the future of the city's prison following reports that it is under review but says he understands no decisions have yet been made.
The leader of Lincolnshire County Council says Lincoln needs to retain a remand prison.
Councillor Martin Hill says anything less than that will affect the area's ability to deliver justice and will also harm the local economy.
His comments come as it is confirmed Lincoln's jail is under review.
The Prison Service has confirmed that it is reviewing the future of Lincoln Prison but insists no decisions have yet been made about its future and that there are currently no plans to close the site.
Lincolnshire County Council says it understands plans are being discussed that could see Lincoln Prison closed.
The Ministry of Justice is carrying out a review of jails and is considering the future of the site on Greetwell Road which, if it remains open, could be downgraded to a category C site.
A final decision on the future of the prison is expected to be announced over the next ten days. While that review carries on, the leader of Lincolnshire County Council has written to the Justice Minister Chris Grayling to voice his opposition to the change.