Alexander Grothendieck est mort.
He was 86. It’s a shame he didn’t make it to 87, because he probably would have thought it was prime. (The link goes to Allyn Jackson’s profile in the Notices of the American Mathematical Society, which is worth the read.)
God plays dice 
Another AMS article about him: http://www.ams.org/notices/200808/tx080800930p.pdf