Sorry to hear of the death and hope it doesn't cause any problems.
Before you purchased the Sea Hare, had you heard the truth about them, that they should be used only as a temporary last resort(more snails are much better), that they easily die, get sucked into powerheads, chopped into pieces and can actually
nuke the tank?
This thread of the last few days shows what can happen:
http://utahreefs.com/forum/forum_posts.asp?TID=55268