The top U.S. auto regulator opened an investigation Monday 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 driver told Harris County investigators that his Tesla was on Autopilot before it left a residential road in Katy,...

The sheriff's office said the Tesla driver allegedly failed to remain within a single lane, veered off the road and crashed into the house. | World News

It was not clear which of Tesla's features the driver was using at the time of the crash.