FILE - In this July 1, 2014, file photo, people walk through misters to cool off along Las Vegas Boulevard in Las Vegas. The death of a 4-year-old boy who police say had been left unattended in a stifling hot pickup truck on a 100-degree day illustrates one danger of intense summer temperatures in Las Vegas. Autopsies reveal another. Heat kills, and Clark County Coroner John Fudenberg sees the results. (AP Photo/John Locher, File)