San Diego ? A shark expert says an autopsy has confirmed a great white killed a triathlete in the waters off San Diego County last week.

An investigator from the Medical Examiner’s Office says two shark’s tooth fragments were recovered from David Martin’s body.

Los Angeles-area shark expert Ralph Collier assisted with the autopsy. He said Monday the fragments indicate the shark was a great white 15 to 16 feet long.

Martin was bitten Friday morning while training for a triathlon. The 66-year-old quickly died from blood loss.