Jay Rockefeller, heir to one of the richest dynasties in the US, dies at age 89 The great-grandson of the founder of the Standard Oil oil empire died on November 6 in Washington, Reuters reports. Relatives have not disclosed the cause of his death. Despite his enormous family fortune, Rockefeller chose a political career. He was twice elected governor of West Virginia and became a five-time US senator. One of the main areas of his work was helping low-income families and developing health services.