Lane Crockett was a human male in the 24th century. Crockett was a mercenary.
In 2371, Crockett was hired by Kai Winn Adami to locate the Lost Orb of the Prophets on Bajor. Crockett, however, was actually working for the Aresians and delivered the orb to them. (DS9 - The Secret of the Lost Orb comics: "The Search", "Acceptable Losses", "Gods of War")
Crockett was executed by Dukat when Dukat learned that he had passed information on vulnerabilities with Galor-class starships shielding to the Aresians. (DS9 - The Secret of the Lost Orb comic: "Gods of War")