The Los Angeles coroner was unable to officially identify actor Paul Walker’s body because it was so badly damaged in the wreck that killed him, authorities said Monday. Walker, 40, died Saturday when friend Roger Rodas crashed into a tree, causing their car to burst into flames. “There was a post-collision fire and bodies are not visually identifiable,” said deputy coroner Dana Bee. The Los Angeles County Police Department said it is investigating the single-car crash; sources said Sunday it was trying to determine the Porsche’s speed. Rodas and Walker were traveling on Hercules Street, a hilly road with a posted speed limit of 45 miles per hour.