(Eugene, OR)  --  An autopsy is being conducted to determine the cause of death of a University of Oregon student-athlete.  School officials say 18-year-old freshman Lauren Jones, who was a member of the Ducks' acrobatics and tumbling team, died yesterday after requiring medical attention.  Lane County Public Health officials are investigating whether Jones's death was the result of an outbreak of meningococcemia meningitis, which has hospitalized three students at the university.