I won't name them, but I personally knew two and heard about others.
One was a paranoid schitzophrenic who lived two blocks from the Kingdom Hall. 3 English congregations met there and she went to all 3 of their evening meetings. She regular pioneered, walking all day everyday to "get her time in." It was never enough. She felt ashamed of herself and drank some drain cleaner. She almost lived too, but the damage was too much. Better off that she passed in the hospital.
The other was depressed all his life and couldn't measure up. He was a total inactive JW, but still went to the meetings for the sake of his wife. I am sure the elders didn't help his depression any. You know, all they can do is try to drive a person crazy with "Turn in some field service time." After trying various ways to stay gainfully employed, he took too many pills and passed. Luckily, he had some older insurance policy that did pay out on suicide after so many years. I think he figured that was all he was worth- the insurance payout.