USPS worker's death highlights dangers of extreme heat on the job.

A USPS worker, Eugene Gates, died during his route in Dallas on Tuesday, and heat could be a factor in his death. Gates had worked for USPS for nearly 40 years. Although the cause of death hasn't been determined, the heat index reached 115 degrees on Tuesday. USPS has a Heat Illness Prevention Program to protect employees and educate them about heat illnesses. The company released a statement expressing their sadness and condolences to Gates' family, friends, and colleagues. Funeral arrangements have not been finalized.