LINCOLN, Neb. (AP) – An inmate serving a life sentence for a Lincoln murder has died.

The Nebraska Correctional Services Department says 61-year-old Walter Bradford died Thursday at the department’s Diagnostic and Evaluation Center in Lincoln.

The department says Bradford started his sentence in December 1983. He’d robbed and fatally stabbed Gordon Robert Eno in Lincoln the year before. Brian Perkins also was convicted in the slaying and sentenced to life.

The department says Bradford was being treated for a medical condition, but the cause of his death has not yet been determined.