Zombie Cop.

During a drug raid, a narcotics officer confronts a strange Voodoo priest named Dr. Death, who is chanting. The officer and the priest shoot it out and they both wind up dead. Later, the two rise from their graves and return to the land of the living as zombies. Dr. Death is resurrected with a new mission in mind, to take over the world. The "zombie" cop enlists the aid of his old police buddies to stop the mad priest.