Latest local news, weather and high school sports from the Midlands

COLUMBIA, S.C. (AP) -- A South Carolina inmate has been charged with threatening the life of an associate prison warden.

The State Law Enforcement Division said Wednesday 21-year-old Davorius Mack had been charged with four counts of threatening the life of a public official.

Mack is serving an 11-year sentence for the 2006 shooting death of a Rock Hill store clerk. Mack pleaded guilty to felonies including accessory after the fact to armed robbery and murder in the death of 69-year-old Ned Marshall, who was found shot in the chest and leg.

Mack started his sentence in 2007 at a maximum security prison in Pelzer. Prison officials say he has been convicted of more than 30 disciplinary infractions, including threatening to inflict harm and striking an employee.

(Copyright 2010 by The Associated Press. All Rights Reserved.)