Federal safety investigators say the driver of a runaway Tesla that killed a grandmother in her home last month had pressed the accelerator to full speed, suggesting the vehicle’s self-driving software was not to blame.

The driver accused of crashing a Tesla into a Katy-area home, killing a 76-year-old woman, has now been charged with manslaughter, according to the Harris County Sheriff’s Office.

The family of 76-year-old Martha Avila, who was killed after a Tesla crashed into their Katy home, has filed a lawsuit against Tesla and the driver, alleging the vehicle's automated driving systems were defective despite investigators finding no evidence of a mechanical malfunction.

The Harris County Sheriff’s Office says investigators have found no evidence of a mechanical malfunction in the Tesla involved in a deadly crash that left a 76-year-old Katy woman dead after a vehicle slammed into her home Friday night.

A Katy family is speaking out after a Tesla crashed into their home, killing 76-year-old Martha Avila, as federal investigators work to determine what happened.

The top U.S. auto regulator has opened an investigation after a Tesla using an automated driving feature slammed into a Texas home at high speed and killed a 76-year-old woman standing inside.

A Tesla allegedly on autopilot crashed into a Katy home, killing a 76-year-old woman inside, according to the Harris County Sheriff’s Office.