The driver of a Tesla Model 3 that crashed into a Katy, Texas home on June 19, killing 76-year-old Martha Avila, has been charged with manslaughter. Michael Butler, 44, was booked into Harris County Jail on July 2 with bail set at $150,000. As investigators piece together what happened, the evidence is pointing squarely at driver behavior — not the vehicle.
What the Vehicle Data Shows
According to investigators, vehicle data and video footage tell a damning story: approximately six seconds before impact, Butler pressed the accelerator pedal to 100%, reaching 73 mph in a residential area. The brake pedal was not applied at any point in the minute leading up to the crash. Post-crash inspections found no evidence of mechanical failure, a stuck accelerator, or floor mat interference — ruling out the vehicle as a contributing factor.
Butler claimed the car was operating in 'self-driving mode' or 'Autopilot' at the time. Tesla's Head of AI, Ashok Elluswamy, directly contradicted that account, stating that while FSD was engaged, Butler 'manually overrode self-driving by pressing the accelerator all the way to 100% of the accel pedal.' Pressing the accelerator pedal is a documented override that immediately transfers control back to the driver under Tesla's current FSD implementation.
The Google Search History
Perhaps the most striking detail to emerge: investigators found multiple Google searches on Butler's phone from May 2026 — weeks before the crash — including phrases like 'tesla fsd not aggressive enough 2026 model,' 'FSD is not aggressive enough for city driving,' and 'tesla fsd too timid.' The searches suggest Butler may have been deliberately trying to find ways to make the system drive more aggressively, which stands in direct contrast to his claim that the car acted on its own.
Inconsistencies in Butler's Account
Butler's credibility took another hit from details reported by @wholemars. Despite being awake, coherent, and stable at the hospital with no serious injuries after the crash, Butler told officers he 'remembers nothing before the crash.' Investigators also noted he was a DoorDash driver who had just completed his last delivery of the night before the incident.
Federal Investigations and Civil Lawsuit
Both the NHTSA and the NTSB have launched special investigations into the crash. Separately, the family of Martha Avila — Jennifer and Justin Barbour — has filed a civil lawsuit against both Butler and Tesla, alleging negligence and defective design of Tesla's driver assistance systems, and seeking over $1 million in damages. The civil case against Tesla is likely to hinge on whether FSD's design adequately prevents or warns against accelerator-pedal overrides at dangerous speeds.
Butler's first court appearance is scheduled for Monday, July 6. The criminal case, the dual federal investigations, and the civil lawsuit mean this story has a long way to run — but the core facts available today paint a picture that is very different from the initial 'car drove itself into a house' narrative that circulated after the June 19 crash.
Marcus covers Tesla's software releases, FSD rollouts, and OTA changes. Background in automotive engineering. Based in Austin.
Sources verified at publish time. Spotted an inaccuracy? Email editorial@basenor.com.
