Sounds like he died some time after the house fire, due to the injuries incurred.
"Tony Hsieh, the former CEO of Zappos, died peacefully and surrounded by family on Friday, according to a statement emailed to CNN by Megan Fazio, a spokesperson for DTP Companies, a Las Vegas-based enterprise for which Hsieh served as the visionary.
Hsieh, 46, died from injuries sustained in a house fire that occurred in Connecticut while he was visiting family, according to Fazio."
The cause of death has been released. He died in a house fire.
Edit: Died of injuries sustained in the fire, not in the house itself.
My point was just that there seems not to be any behavioral reason that this happened.