<p>Authorities are seeking a food delivery driver who became embroiled in an argument with a a worker for a third-party vendor at Amazon and fatally shot the 26-year-old worker early Monday in Matteson, officials said. </p><p>The incident unfolded shortly after midnight in an employee parking lot outside 7001 S. Vollmer Rd., an Amazon fulfillment center that is open 24-hours, according to the Cook County medical examiner's office and a village spokesperson.