46-18-220. Sentences for certain offenses committed in official detention — death penalty. An offender convicted of having committed attempted deliberate homicide, aggravated assault, or aggravated kidnapping while in official detention, as defined in 45-2-101, shall, if the provisions of 46-1-401 have been complied with, be sentenced to death or life imprisonment as provided in 46-18-301 through 46-18-310.