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.

During the Civil War, both sides used firing squads to kill deserting soldiers. Today, people on death row can choose to die that way in some states.

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.