• Blood tests were negative for alcohol, carbon monoxide
  • Police found no evidence McClendon committed suicide

Oklahoma’s chief medical examiner determined that Aubrey McClendon’s death was an accident when his Chevy Tahoe ran off the road March 2 and slammed into a wall.

McClendon’s blood tested negative for alcohol, according to a report Wednesday signed by Marc Harrison, a pathologist with the state medical examiner. Doxylamine, an over-the-counter antihistamine, was detected but not confirmed in his liver. A test for carbon monoxide was negative. The medical examiner in March said the Chesapeake Energy Corp. co-founder died from wounds caused by multiple blunt force trauma.

"This 56-year-old white male was found unresponsive within a severely crushed and burned motor vehicle after it apparently impacted a bridge,” according to the report. “There were extensive thermal burns noted to the decedent."

Oklahoma City police said earlier on Wednesday that suicide couldn’t be ruled out, though they found no evidence that McClendon took his own life. His 2013 sport-utility vehicle crashed the morning after a federal grand jury indicted him on bid-rigging charges. A report in March showed that McClendon, made no serious attempt to slow his SUV as it veered across the road and smashed into a concrete wall at 78 miles per hour, bursting into flames and killing him.

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