no alcohol was involved in the accident, but an unspecified amount of the over the counter first-generation antihistamine and short-term sedative drug Doxylamine (which is used as an antihistamine or to treat insomnia) was found in Mr. McClendon's system. Background The event occurred one day after McClendon's indictment by a federal grand jury accusing him of violating antitrust laws from 2007 to 2012 while the CEO of Chesapeake Energy. A spokesman for the U.S. Attorney in Oklahoma City disputed initial reports that McClendon was en route to the courthouse when the crash occurred. The spokesman said no arraignments or meetings were scheduled with McClendon on the day of his car accident. Discussion and investigation Oklahoma City Police spokesman Paco Balderrama said of McClendon's actions, "He pretty much drove straight into the wall. The information out there at the scene is that he went left of center, went through a grassy area right before colliding into the embankment. There was plenty of opportunity for him to correct and get back on the roadway, and that didn't occur." On June 9 the medical examiner classified the death as an accident. On the day of the incident, local police indicated that it was too early to determine if the collision was intentional or if McClendon may have suffered a medical emergency. He was not wearing a seat belt at the time of the crash but this was not unusual. Two weeks later, Oklahoma City investigators announced that the collision occurred at , later ruled 88 mph with no evidence of a health emergency, although several additional weeks would be required for toxicology tests and an official cause of death. Two months later, with the medical examiner's final report still pending, Balderrama announced that the police investigation found no evidence of suicide, including no emails or messages implying this, but neither could it be ruled out: "Had he slept at all? It's very possible he suffered a medical event... We may never know one-hundred percent what happened." The medical examiner classified the death as an accident. McClendon was regarded as a very optimistic person by several people who knew him well. References External links American Energy Partners Federal indictment for violating antitrust laws (2016) American energy industry executives Businesspeople from Oklahoma City 1959 births 2016 deaths American chief executives American billionaires Duke University Trinity College of Arts and Sciences alumni Oklahoma City Thunder owners