. >> reporter: it's been a year since the fiery crash on highway 101 that killed walter huang. for his widow, is pain is fresh. >> we miss him so much. not just family. friends miss him a lot. >> reporter: now she's filed a lawsuit saying tesla is responsible for his death. the document alleges tesla's auto pilot feature was defective. >> took him out of his lane of safety, pointed him at a concrete fixed barrier and accelerated 10 miles per hour in three seconds and drove him into the barrier. >> are the vehicle was traveling 70 miles per hour at the time of impact. a passerby pulled him from the tesla but it was too late. >> i think they knew there were problems and blithes with the car. >> reporter: a preliminary report from the ntsb says "the vehicle did not detect the driver's hands on the wheels in the six seconds before the crash." they say there may be a problem with that. >> i think will is a lot of confusion about the auto pilot which tesla encourages calling it automatic pilot. it is a really fancy cruise control. >> reporter: while tesla decline today comment on the