Ala. Code § 40-15-1

The terms “executor,” “administrator” and “legal representative,” used interchangeably in this chapter, shall be held to mean the executor or administrator or trustee or legal representative of the decedent whose estate is subject to an estate tax under this title. In the event no executor or administrator is appointed and qualified, then the term “executor” as used herein shall be held to mean any person in actual or constructive possession and acting for any estate subject to tax under this chapter.