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Yes, three star flag officers commit suicide daily.
Its not unknown. An Army General took his own life two days before taking a major command a couple of years ago.
http://www.freerepublic.com/focus/f-news/3486672/posts
Suicide is a problem throughout society, to include the military. I have known several soldiers I served with commit suicide. They all had reasons to live, but let thier despair/frustrations take over for just long enough for an irrevocable desicion.
This sucks for his family, I had a nephew commit suicide five years ago during a messy divorce. His family is still coping with the loss.