Full story from Washington Post:
Stephen Hawking Takes a Buoyant Ride on a Zero-Gravity Flight
and press release from zeroG:
Stephen Hawking Experiences the Freedom of Weightlessness
He was a MUSICIAN, ASTRONOMER, EDUCATOR, CAT LOVER, ATHEIST, AND AMERICAN PATRIOT. Milo kept a lot of people thinking, learning and entertained for many years. He probably angered a few, too. No matter--he is sorely missed.