The Oklahoma medical examiner ruled the crash that killed shale pioneer Aubrey McClendon was an accident, according to the autopsy report released Wednesday.

No alcohol was involved in the accident, but an unspecified amount of one drug—doxylamine, which can be used as an antihistamine or to treat insomnia—was found in Mr. McClendon's system, the report said.

Mr. McClendon suffered a number of injuries in the single-vehicle crash, including several broken ribs, a broken pelvis and a broken back, according to the autopsy report.

Those findings are consistent with the medical examiner's previous determination that the former chief executive of Chesapeake Energy Corp. died of multiple blunt force trauma.

The deadly crash on March 2 occurred one day after Mr. McClendon was indicted on a single count of conspiring to rig the price of oil and gas leases.

Write to Erin Ailworth at Erin.Ailworth@wsj.com

(END) Dow Jones Newswires

June 08, 2016 12:45 ET (16:45 GMT)

Copyright (c) 2016 Dow Jones & Company, Inc.
Chesapeake Energy (NASDAQ:CHK)
Historical Stock Chart
From Mar 2024 to Apr 2024 Click Here for more Chesapeake Energy Charts.
Chesapeake Energy (NASDAQ:CHK)
Historical Stock Chart
From Apr 2023 to Apr 2024 Click Here for more Chesapeake Energy Charts.