Spate of rock attacks claims young woman's life in Colorado.

A 20-year-old woman, Alexa Bartell, was killed in Colorado after a rock was thrown into her moving car while she was on the phone with a friend. The friend tracked her phone and found her already dead. This was the fourth of five rock-throwing incidents reported on Wednesday night, causing minor injuries for two other drivers. Police have tracked down a truck of interest but the suspect has been ruled out. They are searching for suspects and have issued an appeal to the public for any information. The rocks in question appeared to be a type commonly used in landscaping.