Three men were arrested after allegedly hurling a landscaping rock at a Colorado woman, killing her as she drove just outside of Denver, authorities said Wednesday. Alexa Bartell, 20, "was killed when a rock was thrown through her windshield as she was driving" north in the 10600 block of Indiana Street at about 10:45 p.m. in Westminster on April 19, according to a statement from Jefferson County Sheriff's investigators. Bartell was the last of several cars "struck by large landscaping rocks in a spree that began shortly after" 10 p.m. that night near 100th Avenue and Simms Street in Westminster,...