Tesla’s door handles have drawn attention after a Bloomberg News investigation uncovered a series of incidents in which people were injured or died after they were unable to open doors after a loss of power, particularly after crashes. NHTSA, the U.S. auto safety regulator, disclosed last month that it’s investigating whether some Tesla doors are defective, citing incidents in which exterior handles stopped working and trapped children inside. “This case arises from catastrophic design defects in the Tesla Cybertruck that turned a survivable crash into a fatal fire,” according to the Nelson family’s complaint. The family’s lawyer, Roger Dreyer, said the decision to add Tesla as a defendant Thursday followed an inspection of the Cybertruck wreckage. The cases are Nelson v. Tesla Inc. and Tsukahara v. Dixon, 25CV120058, both in California Superior Court, Alameda County.