Hmm... well, since dreaming is essentially an out of body experience (in that you are not using your physical body to interact with anything; astral planes and such have yet to be proven), I expect it wouldn't be different.

One recent LD I had, I got killed, watched my body being dragged out of the room, and became lucid when I saw my own dream body dead. That's about as close to what you describe; and it was just a run-of-the-mill LD, though I did accomplish the month's task in it. *points to egg badge* That dream's in my DJ.

Oh, I did once have an LD in which I was already dead, which consisted of floating around like a ghost, with no one noticing me. Interesting, that. And another in which I got resurrected...

Meh. Dream death isn't all it's cracked up to be.

Ripping off your own leg, though... that takes guts, man.