Prof. William Thurston passed away on Aug. 21, 2012. His MO profile page gives Feb. 22, 2012 as the date of his last log-in. Who is the person who wrote the year of his death in his profile page? Was it one of the moderators? Was this done on request of the family (or of Cornell University), or was it a personal initiative?
Please see this discussion, from the old forum 'tea' before it was superceded by MO meta: http://mathoverflow.tqft.net/discussion/1429/loss-of-a-member/ The discussion indicates that it was Anton Geraschenko who added the text. Related MO post: Wikipedia story about Bill Thurston's death.