Walter Foxcroft, 43, was found dead inside a hyperbaric chamber at the Arizona facility he co-founded last year.

Arizona physical therapist Walter Foxcroft dies in a hyperbaric chamber fire at his Lake Havasu clinic. Learn about the risks of oxygen therapy and community tributes.

Lake Havasu City authorities said the fire killed clinic owner Walter Foxcroft, 43. Hyperbaric therapy involves breathing pure oxygen in a high pressure chamber.