(a) If the State gave notice under § 2-203(1) of this title, the court shall conduct a separate sentencing proceeding as soon as practicable after the defendant is found guilty of murder in the first degree to determine whether the defendant shall be sentenced to imprisonment for life without the possibility of parole or to imprisonment for life.

(b) (1) A determination by a jury to impose a sentence of imprisonment for life without the possibility of parole must be unanimous.

(2) If the jury finds that a sentence of imprisonment for life without the possibility of parole shall be imposed, the court shall impose a sentence of imprisonment for life without the possibility of parole.

(3) If, within a reasonable time, the jury is unable to agree to imposition of a sentence of imprisonment for life without the possibility of parole, the court shall impose a sentence of imprisonment for life.