Sad to say, two Oscar winners took their own lives in 2014: Philip Seymour Hoffman and Robin Williams. Never a good thing, especially with the talent these two had.
In the past we had George Sanders and Gig Young. That's all I can think of for now.
I know I'm being morbid, but just curious about this thing happening with actors. Add some other names, if they fit. Actually, go ahead and include people besides actors: directors, writers, music composers, etc.