I just got word from Mikkel Thorup that Mihai Patrascu passed away. I had heard that he was ill, and only realized the seriousness of his condition when I saw him at STOC 2012. He came in a wheelchair to be honored for getting a Presburger award, and the entire room gave him a standing ovation.
I can only hope that he's out there proving lower bounds in the sky, and arguing fiercely with the clouds while he does so.
Update: There is now a memorial page for Mihai at mipmemorial.blogspot.com. Please visit there to post your comments, and have a drink for Mihai !