The security firm that manages the private prison for Category B men said the man died in hospital on October 25 after being transferred from the Brookfield Drive facility five days earlier.
A prison at the HMP Altcourse died of a coronavirus after an outbreak at the prison, G4S has confirmed.
As with all prison deaths, the medical examiner must determine the cause of death.
His age and name were not disclosed.
The spokeswoman confirmed that the prisoner tested positive for corona virus on October 17, before being immediately isolated and then transferred to the hospital on October 18.
The cause of his death remains unconfirmed, but G4S said the man was suffering from long-term and complex health problems prior to his hospitalization.
He is the last HMP inmate to die of coronavirus after it was confirmed that three people died within three weeks after testing positive for the virus earlier this year.
A spokeswoman for G4S, the operator of the HMP Ageing Course, also confirmed that two inmates working as prison cleaners had tested positive for coronavirus.
HMP Altcourse Deputy Director Lyndon Noonan said: “On October 25, 2020, a man from HMP Altcourse died in a local hospital, and our thoughts are with his friends and family at this difficult time.
They were immediately isolated and have not returned to work since.
“As with all prison deaths, it is up to the medical examiner to determine the cause of death.
The ombudsman for prisons and probation has been informed in the meantime and the cause of death will be determined by a forensic doctor.
“The safety of those in our care is our primary concern, and we continue to apply strict rules regarding isolation and contact tracing procedures that are consistent with all national guidelines.
Recently, ECHO reported that two other prison inmates had died of coronavirus in the early stages of the pandemic.
It was determined that Covid-19 contributed to Neilson’s death and was the cause of Jones’ death.
Neilson, 57, was recalled to Altcourse in February after violating a sexual harm prevention order.
Garry Neilson and Gwynfor Jones, who both had underlying health problems, died in April after being infected by the virus.