Dolan's Cadillac (2009)

In Las Vegas, school teachers Robinson and his wife Elizabeth are trying for a baby. While horse riding through the desert one evening, Elizabeth witnesses the execution of two coyotes and an illegal immigrant by the human trafficker Jimmy Dolan and decides to report the incident to the police. However, she loses her cellular and Dolan finds it, tracks her address down and threatens her. Elizabeth goes to the FBI with Robinson and they move to a safe house under the protection of two agents. When Elizabeth sneaks from the house to buy pregnancy tests, her car explodes and she dies. Robinson decides to avenge Elizabeth's death.