The mystery deepens into the fiery death of former Zappos CEO and Tony Hsieh. The 46-year-old billionaire died from smoke inhalation during a house fire in Connecticut. Investigators say Hsieh was locked inside a storage shed. “The male is barricaded inside. He's not answering the door. Everyone else is outside the house and trying to get him to open up,” the 911 dispatcher said in a recording. Coroners ruled Hsieh’s death an accident, but there are still questions about what happened.