A Casper woman accused of huffing dust cleaner before a car wreck that killed a 50-year-old man has pleaded not guilty to aggravated vehicular homicide. The Star-Tribune reports prosecutors say 39-year-old Heather Christensen's car sideswiped a truck at an intersection Nov. 14 and then struck a light pole. Passenger Richard Condelario died. Authorities say they found two cans of compressed air - one in Christensen's vehicle and another nearby. Court records say she acknowledged huffing the cleaner before the crash.