Paul Otellini, Intel's previous CEO, died in his sleep on Monday, the company announced this morning. He was 66. Otellini served as Intel's fifth chief executive from 2005 through 2013, and leaves behind a legacy of the company's dominance in x86 processors. Notably, he also worked with Apple as it moved away from PowerPC chips and adopted Intel's wares. After retiring in 2013, Otellini revealed one major regret during his tenure: not working hard enough to get Intel's chips in the iPhone. Consequently, Intel mostly missed on the smartphone revolution.