In a statement, the National Highway Traffic Safety Administration said preliminary reports indicated that the crash occurred when a tractor-trailer made a left turn in front of the Tesla, and the car failed to apply the brakes. It is the first known fatal accident involving a vehicle being driven by itself by means of sophisticated computer software, sensors, cameras and radar. The safety agency did not identify the Tesla driver who was killed. But the Florida Highway Patrol identified him as Joshua Brown, 40, of Canton, Ohio.

http://www.nytimes.com/2016/07/01/business/self-driving-tesla-fatal-crash-investigation.html?_r=0