I just lost my Majestic Angel. I noticed some odd behaviour last week, but then he returned to normal. Then, yesterday, he began to swim in one spot just in front of a circulation pump exit. Died tonight.
Doing my best necropsy, it looks like he had not eaten in some time. Even though he appeared to be a very healthy body weight. Can't find anything really wrong with him. When I first noticed symptoms, his appearance was completely normal.
I had only had him for 7 years. I suspect his natural life expectancy was longer than that.

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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank:
http://www.canreef.com/vbulletin/showthread.php?t=28436