The National Transportation Safety Board (NTSB) said Wednesday that the driver of a Tesla that crashed into a house in June had pressed the accelerator pedal to 100%, defeating the company’s fully autonomous (supervised) driving software.

Data recovered from the Tesla showed the vehicle was traveling more than 70 miles per hour when it crashed into a home in Katy, Texas, killing 76-year-old resident Martha Avila, according to the NTSB. The victim’s family has since sued the alleged driver, Michael Butler, 44, and Tesla, alleging negligence. Butler has also been charged with involuntary manslaughter.

The safety board shared the information as part of a preliminary report on the progress of its investigation into the crash. The National Highway Traffic Safety Administration is also investigating the incident.

The data confirms Tesla’s account of the accident, which the company shared in the days after it happened to show that its advanced driver assistance system was not to blame. “This [allegation] it doesn’t make sense. FSD drives slowly down neighborhood streets and this was a high speed accident! Tesla CEO Elon Musk wrote on X shortly after the accident.

The NTSB said Wednesday that the 44-year-old driver was using full self-driving (supervised) driving on Rose Hollow Lane, a two-lane residential road with a speed limit of 30 miles per hour, before the crash. Security camera footage obtained by the safety board showed the car speeding through an intersection, leaving the road and hitting the house. The “weather was clear, the road was dry, and there were daylight conditions,” according to the NTSB.

Tesla requires drivers using fully autonomous (supervised) driving to pay attention to the road and be prepared to take control at any time. Butler allegedly told authorities that he had “blacked out” and was using Tesla’s driver-assist system. Police reportedly found that their Google searches included the terms “Tesla FSD not aggressive enough in 2026,” “Tesla not aggressive enough,” and “Tesla FSD too timid,” according to local ABC-affiliated news station KTRK TV.