I knew one young brother in his early 20's that committed suicide. I had heard he was struggling with depression and I suspect that he didn't want to be a JW any longer but he felt bad abandoning his mother. His other, older brothers had already left. I also suspect that the only help he got was some encouragement to try and do more as a JW. He did try, really. He was very popular even outside the JW community (over 1000 attended his funeral and many were not JW's).
It was also the most unusual JW funeral I have ever been to. In addition to the size of the crowd (standing room only, people outside in the parking lot - held at a funeral home) - the talk was totally off outline - they even played some of his recorded music (lots of crying form the young girls present).