Several.
Of the following four successful attempts one was was actually in my congregation.
Four who were "active" baptized publishers at the time of suicide. 1. One brother used a car exhaust; 2. A sister took an overdose of drink and pills. 3. Another brother hanged himself in the garden shed. Each one left teenage or adult kids.
4. The final one (single - no kids) was early twenties and he locked himself in a walk-in cupboard and overdosed on pills and drink.
Then there are those on the periphery of JW'ism. (Relatives of JW's or ex JW's or brought up as JW's)
One jumped from a high bridge, one gassed himself in a kitchen oven.
Then there are those who you aren't sure whether it was a suicide attempt or being high on a drug/drink cocktail or did they "jump" or "fall" from the balcony or building.