Shale drilling pioneer Aubrey McClendon died from multiple blunt force trauma during the March 2 car wreck that claimed his life, according to the Oklahoma City Office of Chief Medical Examiner.

Toxicology tests and a manner of death ruling are still pending, Amy Elliott, a spokeswoman for the agency, said in an e-mailed statement on Friday. McClendon, the co-founder and former chief executive officer of Chesapeake Energy Corp., was 56 when his sport-utility vehicle slammed into a concrete embankment and burst into flames.

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