From Alabama statute:
Article 1 Homicide.
Section 13A-6-1 Definitions.
Section 13A-6-2 Murder.
Section 13A-6-3 Manslaughter.
Section 13A-6-4 Criminally negligent homicide
Section 13A-6-2
Murder.
(a) A person commits the crime of murder if:
(1) With intent to cause the death of another person, he causes the death of that person or of another person; or
(2) Under circumstances manifesting extreme indifference to human life, he recklessly engages in conduct which creates a grave risk of death to a person other than himself, and thereby causes the death of another person; or
(3) He commits or attempts to commit arson in the first degree, burglary in the first or second degree, escape in the first degree, kidnapping in the first degree, rape in the first degree, robbery in any degree, sodomy in the first degree or any other felony clearly dangerous to human life and, in the course of and in furtherance of the crime that he is committing or attempting to commit, or in immediate flight therefrom, he, or another participant if there be any, causes the death of any person.
(b) A person does not commit murder under subdivisions (a)(1) or (a)(2) of this section if he was moved to act by a sudden heat of passion caused by provocation recognized by law, and before there had been a reasonable time for the passion to cool and for reason to reassert itself. The burden of injecting the issue of killing under legal provocation is on the defendant, but this does not shift the burden of proof. This subsection does not apply to a prosecution for, or preclude a conviction of, manslaughter or other crime.
(c) Murder is a Class A felony; provided, that the punishment for murder or any offense committed under aggravated circumstances, as provided by Article 2 of Chapter 5 of this title, is death or life imprisonment without parole, which punishment shall be determined and fixed as provided by Article 2 of Chapter 5 of this title or any amendments thereto.
(Acts 1977, No. 607, p. 812, §2005.)
Section 13A-6-3
Manslaughter.
(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.
(Acts 1977, No. 607, p. 812, §2010; Acts 1987, No. 87-713, p. 1260.)
Section 13A-6-4
Criminally negligent homicide.
(a) A person commits the crime of criminally negligent homicide if he causes the death of another person by criminal negligence.
(b) The jury may consider statutes and ordinances regulating the actor's conduct in determining whether he is culpably negligent under subsection (a) of this section.
(c) Criminally negligent homicide is a Class A misdemeanor, except in cases in which said criminally negligent homicide is caused by the driver of a motor vehicle who is driving in violation of the provisions of Section 32-5A-191; in such cases criminally negligent homicide is a Class C felony.
(Acts 1977, No. 607, p. 812, §2015; Acts 1979, No. 79-664, p. 1163, §1; Acts 1988, 1st Sp. Sess., No. 88-916, p. 510, §1.)
Given the facts of the story (slim they may be at the moment), and Alabama's statutes, it appears like the District Attorney is justified in pursueing homicide charges. There are three flavors of murder for the DA to choose from. See bolded text above.