Argh.. that sucks. I've had fish die of stress.. <img src="graemlins//confused.gif" border="0" alt="[confused]" /> Not sure if that's you case though.
Good Luck in the future!
Galina
sounds like an acclimation issue, a sick fish, or a non-cycled tank.
is this the first animal you were presenting to the tank? How long did you acclimate the fish before intrducing it into the tank? What did it look like in the LPS?