Aubrey McClendon, a founder and former chief executive of Chesapeake Energy, died in a fiery single-car crash Wednesday, a day after he was charged with conspiring to rig bids for oil and natural gas leases.

McClendon, 56, crashed into an embankment while traveling at a "high rate of speed" in Oklahoma City just after 9 a.m. local time, said Capt. Paco Balderrama of the Oklahoma City Police Department. Flames engulfed McClendon's vehicle "immediately," Balderrama said. He added that police determined McClendon was not wearing a seatbelt after earlier being unable to tell.