A 25-year-old man arrested following the death of an inmate at HMP Doncaster on Friday evening has now been charged with murder.
Kieron Simpson, 25, of HMP Doncaster, was charged in connection with the death today.
The victim has been identified as being 43-year-old Robert Bryan, also of HMP Doncaster.
He was allegedly assaulted inside the prison at around 6pm and died at hospital later that night.
A post-mortem examination concluded he died as a result of head injuries.
Both men were inmates at the prison.
Simpson has been remanded into custody and will appear before Doncaster Magistrates Court tomorrow.