2 spring to mind; plus an attempted one which I count as a serious attempt - it was a survived - a jump from a 3rd floor car park.
A couple of overdoses too. But they survived.
Oh, a family in the 70's; wife tried gassing herself but survived, her UBM stuck his head in a gas oven and died. Their daughter jumped a high bridge.
What a happyfying experience their contact with jw's was ...