Having learned of the tragic death by suicide of the American tenor Jerry Hadley, the best I can do is refer you to the post by La Cieca and the discussion that follows it. There is also an obituary in The New York Times. Everyone who heard Hadley will treasure the memory of a wonderful voice and superlative performer.
Is it true that artistic, creative souls are especially prone to depression? I reckon depression is common across the board - I've known accountants, management consultants and many others who've suffered it. But the depressed artist remains the most potent symbol, because he or she brings such joy and comfort to others while experiencing a living hell.