On the evening of June 19, a 2025 Tesla Model 3 traveling at 73 mph crashed through the brick front wall of a home in a quiet cul-de-sac in Katy, Texas. Martha Avila, a 76-year-old grandmother, was pinned in the wreckage. She died at hospital.
The driver, 44-year-old Michael Butler, told police and paramedics that the car had been in Tesla's Full Self-Driving mode when he blacked out while changing music on the touchscreen. He tested negative for alcohol, drugs, seizures, stroke, and heart attack. His account had the shape of a tragic accident.
Then investigators looked at the car's own data.
According to the criminal complaint filed by the Harris County District Attorney, the vehicle's built-in recorder showed Butler pressing the accelerator fully to the floor just as the self-driving system was steering the car into a left turn toward his next DoorDash delivery stop. He held the pedal down for roughly six seconds. The car shot straight into the cul-de-sac, hit a curb, became airborne, and drove through the house. The brake was never touched. No mechanical fault was found in the car.
His phone made the case worse. Investigators found searches from the weeks before the crash: the car's self-driving mode was, in his words, "too timid" and "not aggressive enough for city driving." The picture prosecutors are painting is not of a passive passenger who blacked out, but of a driver who had been frustrated with a system he felt drove too carefully.
Butler was arrested on July 1 and is currently held in Harris County jail on a $150,000 bond. Manslaughter in Texas is a second-degree felony carrying up to 20 years in prison.
The family of Martha Avila has filed a separate civil lawsuit seeking at least $1 million in damages, naming both Butler and Tesla. The lawsuit alleges that Tesla's system has a "design defect" and a history of known danger. The US road safety regulator, NHTSA, has opened a new special investigation into this crash, adding to an already significant regulatory burden on the company.
That broader regulatory picture matters here. As of March 2026, NHTSA had already escalated a separate probe into Tesla's Full Self-Driving system to its final stage before a potential recall, covering 3.2 million vehicles. That investigation focuses on whether the camera-based system fails to detect poor visibility conditions like sun glare or fog and whether it warns drivers in time. There are currently three concurrent NHTSA investigations into Tesla's self-driving features.
But the Katy crash raises a different set of questions than those technical probes. This is not a case where the system failed to see something. According to prosecutors, the system was working as intended, trying to follow a route, while the human driver overrode it and floored the accelerator.
This is the core tension in how self-driving technology is sold versus how it actually works. Tesla calls the feature "Full Self-Driving," but legally and technically, it remains what regulators classify as a Level 2 system: the driver is required to stay alert and in control at all times. Courts have generally placed primary responsibility on the driver for exactly this reason. A Florida jury awarded $243 million against Tesla in August 2025 in a separate Autopilot case where the system's marketing was found to have misled users, but that case is under appeal.
The Katy case cuts differently. The evidence, at least as prosecutors present it, points to a driver who was not a passive victim of automation, but who actively disabled a cautious system to go faster. The criminal charge reflects that: the law still treats the human in the seat as the operator.
For anyone who uses driver-assistance features in their own fleet, company vehicles, or even personal cars, this case is a plain reminder. These systems are tools, not replacements for the driver. The name says "Full Self-Driving." The legal responsibility stays with you.