Topline: Legendary energy tycoon and hedge fund manager T. Boone Pickens died at 91 on Wednesday after being in declining health following a major fall and a series of strokes in 2017.

Forbes ranked Pickens as a billionaire in 2013, but he soon he fell off The Forbes 400 list of the wealthiest Americans. At the time, he tweeted to his more than 110,000 followers: “Don’t worry. At $950 million, I’m doing fine.