killed six children. police released a few details about walker. at the press conference, they answered the questions still outstanding. >> we received toxicology reports back today from the tennessee bureau of investigation. it shows no drugs or alcohol in the driver's system. his record included a minor wreck investigated by our agency. >> reporter: the bus he had been licensed to drive since april was full. 37 children. victims include a girl on board with her sister. dameon brown said she waited five hours before she learned her son was killed in the crash. 8-year-old keyonte wilson died wednesday. 9-year-old zoey nash would have