The richest oilman in the United States has died, according to a Friday statement from Endeavor Energy Resources LP. Autry Stephens, founder of Midland-based Endeavor Energy Resources LP, died at 86 years old, the statement said, after he disclosed to the Wall Street Journal in February that he had been diagnosed with prostate cancer. Following his cancer diagnosis, Stephens agreed to sell Endeavor to Diamondback Energy for $26 billion, making him the richest oil driller in the United States. Stephans had already amassed a net worth of $14.8…
