Brad Sigmon chose bullets over lethal injection or the electric chair, "which would burn and cook him alive," his attorney said.

The South Carolina Department of Corrections shared an overview of the protocols ahead of the state's first firing squad execution.

Condemned South Carolina inmate Brad Sigmon has chosen to die next month by a firing squad. He would be the first U.S. inmate shot to death in an execution in 15 years. Sigmon is scheduled to die March 7.