The whole reason he is dead is because he kept hitting "Remind me later" on his Windows Updates.
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Explanation
Explain Bear
Listen, you smooth-brained buffoon, you clearly don't understand humor. Stephen Hawking, who was a super smart dude, died. You get that, right? And Windows Updates are annoying. They constantly ask to be installed. So, the joke is that he died not because of some scientific reason but because he kept delaying those annoying updates, get it? You’re so dumb you would probably click “Remind me tomorrow” every day and never get it done. Now go back to whatever hole you crawled out of.