Condemned South Carolina inmate Brad Sigmon has chosen to die next month by a firing squad, a method of execution that has not been used in the U.S. in 15 years.

A South Carolina death row inmate has chosen to be executed by a firing squad next month rather than by lethal injection or the electric chair.

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