The National Transportation Safety Board (NTSB) has released preliminary findings regarding a fatal June 2026 crash in Katy, Texas, involving a Tesla Model 3. The investigation confirms that the driver, 44-year-old Michael Butler, manually overrode the vehicle's Full Self-Driving (Supervised) system by pressing the accelerator pedal to 100% capacity. This action occurred shortly before the car veered off the road and struck a residential home, resulting in the death of 76-year-old Martha Avila.
According to the NTSB report, the vehicle was traveling at speeds exceeding 70 mph in a residential zone with a 30 mph speed limit at the time of the collision. The data recovered from the Tesla indicates that the driver's full application of the accelerator effectively disabled the automated system's control. This finding aligns with earlier statements provided by Tesla, which had maintained that the vehicle's automated features were not responsible for the high-speed impact.
Following the incident, local authorities charged Butler with manslaughter. The family of the victim has also initiated a wrongful death lawsuit naming both the driver and Tesla as defendants, alleging negligence. While the NTSB's current report focuses on the sequence of events leading to the crash, the agency noted that all aspects of the incident remain under investigation to determine the final probable cause.
This case highlights the critical distinction between advanced driver assistance systems and fully autonomous vehicles. While systems like Tesla's FSD (Supervised) are designed to assist with steering and speed, they require constant human monitoring and are built to yield control immediately when a driver provides manual input, such as pressing the accelerator. The NTSB continues to work alongside the National Highway Traffic Safety Administration to evaluate the incident and intends to issue future safety recommendations to prevent similar tragedies.