Death Valley: The Revenge of Bloody Bill (2004)

While traveling in a van with their teacher for a contest, a group of college friends are abducted by the criminal Earl, who forces them to go to the ghost town of Sunset Valley to meet his friend that was transporting drugs and money of their own. Once in the town, they realize that the dwellers are zombies and their leader is Bloody Bill, a Confederate soldier seeking revenge the execution of his sister that was hanged by the locals and the population was cursed by Bloody Bill.