Mitchell had recently come out in favor of stricter regulation of fracking in recent years.
He was 94.
The son of Greek immigrants, Mitchell turned his oil development firm into a $3.5 billion powerhouse.
He sold the firm to Devon Energy in 2002, becoming Devon's largest shareholder.
Forbes estimated his net worth at $2 billion.
SEE ALSO: Energy 2040: The EIA's Latest Outlook
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