Celebrated soldier fell victim to 'demons'

• Story Highlights
• Enlisting after 9/11, Joseph Dwyer found himself at "the tip of the spear" in Iraq
  
• He became famous after being photographed helping a boy near Baghdad
  
• After his return, Dwyer increasingly lost touch with reality
  
• 31-year-old died in June after "huffing" cans of aerosol
  
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