Inmate seeks clemency, says he's too fat to execute

• Story Highlights
• NEW: Arguments for and against Richard Cooey's execution heard
  
• Prisoner claims his weight could affect his reaction to a lethal injection drug
  
• Cooey has filed federal lawsuit to stop his October 14 execution
  
• Cooey, 41, is sentenced to die for raping and murdering two young women
  
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