Does a state Court proceeding resulting in a death sentence violate the Fifth and Eighth Amendments when the court fails to ensure the defendant's competency to plead guilty to capital offenses despite known factors warranting a competency evaluation?

QUESTION PRESENTED Does a state Court proceeding resulting in a sentence of death violate the Fifth and Eighth Amendments to the Constitution of the United States when the court fails to insure that the defendant is competent to enter a plea of guilty to capital offenses despite substantial factors known to the court which should have prompted a competency evaluation?