Michael Spindler, Apple CEO from 1993 to early 1996, doesn't seem to have been a CEO at any other company since he was fired from Apple (https://en.wikipedia.org/wiki/Michael_Spindler), although I don't know if this is because he couldn't find another position or because he wanted to do something different with his life; I know that he struggled with stress management during his career at Apple even before becoming CEO.

Michael Spindler presided over the successful PowerPC transition, but unfortunately he also presided over a catastrophic 1995 for Apple, where Apple had to contend with bad Performa x200/x300 models, faulty PowerBook 5300 models with many issues such as chipping and easily-breakable hinges (not to mention the exploding battery at the factory before release), and the release of Windows 95. Gil Amelio ended up taking over in 1996 to try to turn the company around; we all know what happened NeXT.