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What would they prosecute them for? As moreluck stated lots of insurances would be null and void, as you said there could be a will challenge. My guess a will challenge would depend on the timing of the drawing of the will and of the suicide.
I don't know that it is illegal to commit suicide, but it is illegal to attempt, so they can have you committed for professional help.
Well, you'ld think a "normal" person would write up their last will (wishes), before they kill themselves.
And, if I ever would be in the situation to receive or not receive any benefits out of it, I would take his/her last wishes as they wrote in writing.
I would never try to challenge those last wishes !