NEW : Woman suffered brain injury , multiple skull fractures , medical examiner rules . Spotted eagle ray leaps from water , strikes woman on boat , officials say . Score: 6 Spotted eagle ray weighed 75 to 80 pounds , official says .
NEW : Woman suffered brain injury , multiple skull fractures , medical examiner rules . Spotted eagle ray leaps from water , strikes woman on boat , officials say . Victim was 55-year-old woman from Michigan . Spotted eagle ray weighed 75 to 80 pounds , official says .