TragicMonkey
Poisoned Waffles
The former would be quite expensive. And the condemned is taking the place of an actual astronaut, or a space tourist ($$$). I think that'd be my preferred way to go actually. Spaced, with a nice view of Earth. You die from suffocation, and apparently the lack of pressure is not that painful.
But then if haunting rules apply your ghost will be stuck floating in space or in orbit, and rarely will you get a chance to scare people there.