Texas 4-year-old runs over, kills sister

A 16-month-old girl was run over and killed Sunday after authorities say her 4-year-old sibling climbed into a truck and put it in neutral.

The 4-year-old got the keys to the truck, which was parked in the driveway, climbed in, started it, and put it in neutral. The vehicle rolled forward, running over the 16-month-old girl. She was killed instantly.

Deputies were called to the scene and the family was loading a pickup to take to a relative's house. The children' father was inside the house at the time. He heard the truck start and ran to the door. He saw the vehicle rolling forward and ran to stop it.

The truck eventually cam to a stop when it struck a neighbor's fence. An investigation is ongoing.