A. The supreme court shall review all death sentences to determine whether the trier of fact abused its discretion in finding aggravating circumstances and imposing a sentence of death.
B. If the supreme court determines that an error occurred in the sentencing proceedings, the supreme court shall determine whether the error was harmless beyond a reasonable doubt. If the supreme court cannot determine whether the error was harmless beyond a reasonable doubt, the supreme court shall remand the case for a new sentencing proceeding.