I'm hearing rumors that Wally Schirra died last night.

[Update a couple minutes later]

OK, apparently Keith heard it on CNN as well.

So, Grissom, Slayton, Schirra, Shepard are gone. Besides Glenn, who's still with us?

[googling]

OK, Cooper is dead, so it's just Glenn and Carpenter. They could hold a reunion in a phone booth. And I see that Wikipedia has already updated the Mercury 7 page to reflect Schirra's passing.

[Update at 12:30 PM EDT]

Here's the obit from CNN.

Hadn't thought about that, but it's true, he was the only astronaut to fly Mercury, Gemini, and Apollo.