BOISE -- James M. Johnson was recently indicted by a grand jury in Ada County for the first-degree murder of 45-year-old Milo Warnock, according to the Ada County Prosecutor's Office.

Warnock was a 1996 Lewiston High School graduate who died after being assaulted Dec. 10 at the Idaho State Correctional Institution in Kuna, Idaho. Warnock was serving a 2-10 year sentence for a felony DUI charge. He was sent to the maximum security area of the prison after an issue with his medication.

Johnson was indicted by a grand jury Aug. 27. Johnson made his first court appearance Tuesday. His next court date is Sept. 18 before the Ada County District Judge Nancy Baskin, according to a news release from the Ada County Prosecutor’s Office.

Indictments are sealed until a warrant is served on the defendant and the first court appearance is held.

The maximum punishment for first-degree murder is the death penalty or life in prison. The minimum sentence is 10 years in prison.