An inmate serving a 50 year sentence for murder in an East Texas prison has been killed . It happened at the Polunsky unit in Livingston. Right now the office of inspector general is investigating the possible homicide. They believe 69 year old Merlin Livings was killed by his cell mate. Livings has been in prison since 1991 for a murder he committed in Jefferson County. Stay tuned to KTRE for the latest information on this investigation.