The National Transportation Safety Board (NTSB) has initiated an inquiry into a collision that occurred over the weekend in Texas, where a driver crashed into a residence in Katy, Texas, resulting in the death of a resident.

The relatives of the deceased, 76-year-old Martha Avila, have also launched a lawsuit against the driver, Michael Butler, and Tesla, citing negligence.

The NTSB is collaborating with the National Highway Traffic Safety Administration (NHTSA) in looking into the incident. While Butler reportedly informed local officials that he was utilizing Tesla’s Autopilot feature prior to the accident, the company has subsequently stated that it possesses data indicating that Butler had depressed the accelerator pedal completely. This action allegedly “overrode” what was probably the Full Self-Driving software in his vehicle, accelerating his speed to 73 miles per hour before crashing into the house, as per Tesla’s claims.

However, Tesla has not presented additional evidence apart from those statements. The investigations by the NTSB and NHTSA will likely compel the company to provide logs generated by the vehicle’s onboard systems, which will ultimately disclose the specifics of how the crash occurred.