(a) A person commits the crime of manslaughter if:
(1) He recklessly causes the death of another person, or
(2) He causes the death of another person under circumstances that would constitute murder under Section 13A-6-2; except, that he causes the death due to a sudden heat of passion caused by provocation recognized by law, and before a reasonable time for the passion to cool and for reason to reassert itself.
(b) Manslaughter is a Class B felony.