A Tesla Model 3 crashed into a Katy, Texas, home on June 22. The collision killed a 76-year-old woman inside the residence.
The driver informed investigators the vehicle was operating on Autopilot at the time of the crash. Local law enforcement and federal safety officials are investigating the role of Tesla's driver-assistance technology. Officials have not yet confirmed the system's status through the car's data logs.
Tesla stock dropped 1.6% in pre-market trading as news of the investigation broke. The incident raises further questions about the reliability of automated driving systems.