You must be talking about "Bruce" the eel. From what I heard, there always seems to be a green moray there in Stingray city (several generations) and they always call it Bruce.
I was there the first 10 days in December immediately after the 9/11 attacks. No one was flying, there were marines with M16's and grenade launchers at the Miami airport.... well, the fish, rays, and even eels are used to thousands of people feeding them daily. To give you an idea of how deserted Grand Cayman was, you could look up and down 7 mile beach and there was NEVER more than about 50 people on the entire stretch of beach. I am convinced that my girlfriend and I were the only ones in our hotel for at least the first 3 days of our visit (any time we walked thru the lobby we were inundated by the staff asking us if we needed anything and never saw any other guests).
Anyway, we went to dive Stingray City. We got the usual prep, how to feed, and "if we're lucky, we'll see Bruce in a small coral outcropping". Well, the stingrays were so agressive one couple returned to the boat. They were all over us, on my back, my neck, everywhere! I had a yellow jack hit my hand, thinking he would steal a piece of squid, but he missed and my little finger on my right hand ended up completely in his mouth and he ripped flesh off as he backed away. He hit me so hard I was moving backwards in the water! The bad part was I was bleeding in the water looking at my hand, and the dang fish hovered right by me for most of the dive - if i would have had a spear gun I would have gladly taken and eaten him!
Anyway, we never had to look for the moray, he came out, very aggressively, to us. He circled around looking for something to eat and it really made everyone fairly nervous or scared. If a fish will attack you, what will a moray do if he hits you? He hung around for a while, our DM took some squid away from our group and lured the moray away from all of us. No casualties, other than my finger, that has scars to this day, but definitely a story to tell! I've been fairly against feeding now, if you can't imagine why. It really changes the behavior of the animals, imho to the very negative!