Chattanooga Police Chief Fred Fletcher described the bus crash that killed five Chattanooga elementary school students as "every public safety professional’s worst nightmare." Police arrested the driver, 24-year-old Johnthony Walker, and charged him with five counts of vehicular homicide, reckless driving, and other offenses. Authorities say one kindergartner, one first-grader, and three fourth-graders from Woodmore Elementary died. According to the arrest affidavit, Walker was speeding well