WASHINGTON (AP) — A driver so enamored of his Tesla Model S sedan that he nicknamed the car "Tessy" and praised the safety benefits of its sophisticated "Autopilot" system has become the first U.S. fatality in a wreck involving a car in self-driving mode. The National Highway Traffic Safety Administration announced the driver's death Thursday, and said it is investigating the design and performance of the Autopilot system. Joshua D.