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Autopsy: Oklahoma energy magnate’s death accidental

FILE - In this June 6, 2012, file photo, Chesapeake Energy Corp. CEO Aubrey McClendon attends Game 6 of the NBA basketball Western Conference finals, in Oklahoma City. Oklahoma City police say they found no evidence that the death of  McClendon in a vehicle crash a day after he was indicted by a federal grand jury was anything other than an accident. (AP Photo/Sue Ogrocki, File)
FILE - In this June 6, 2012, file photo, Chesapeake Energy Corp. CEO Aubrey McClendon attends Game 6 of the NBA basketball Western Conference finals, in Oklahoma City. Oklahoma City police say they found no evidence that the death of McClendon in a vehicle crash a day after he was indicted by a federal grand jury was anything other than an accident. (AP Photo/Sue Ogrocki, File) FILE - In this June 6, 2012, file photo, Chesapeake Energy Corp. CEO Aubrey McClendon attends Game 6 of the NBA basketball Western Conference finals, in Oklahoma City. Oklahoma City police say they found no evidence that the death of McClendon in a vehicle crash a day after he was indicted by a federal grand jury was anything other than an accident. (AP Photo/Sue Ogrocki, File)

OKLAHOMA CITY (AP) – The Oklahoma medical examiner’s office has ruled that the fiery car crash in which energy industry magnate Aubrey McClendon died was an accident.

An autopsy report released Wednesday showed the 56-year-old had in his system traces of the antihistamine doxylamine, which is sometimes used in sleep aids and can cause drowsiness.

The report indicated McClendon died from multiple blunt force trauma sustained in the March 2 crash, one day after he was indicted by a federal grand jury.

Oklahoma City Police Capt. Paco Balderrama says investigators didn’t find enough evidence to prove whether the crash was intentional.

Police have said the former Chesapeake Energy CEO and part-owner of the NBA’s Oklahoma City Thunder was driving 78 mph when his SUV hit a bridge support and burst into flames.