prosecutor karen keagan told the jury a horror story. the state's version of what happened. >> the man for whom the gunman had signed on to commit a double-murder. a man who was intimately familiar with john and susan sutton. that man -- their son. christopher sutton. >> reporter: then graphic evidence. a crime scene soaked in blood and littered with bullet casings. the medical examiner placed knitting needles in a mannequin to show where susan was shot six times. her son took a deep breath, recoiled, dreadful. but, how would the state prove