Reference for Chullin 78:19

ומעשה נמי בבריא שאמר כתבו גט לאשתי ועלה לגג ונפל ומת אמר רשב"ג

And there actually happened a case where a person in good health said: 'Write a bill of divorce to my wife', and he immediately went up to the roof and fell down from it and was killed, and R'Simeon B'Gamaliel ruled: If he threw himself down, the divorce is valid;<span class="x" onmousemove="('comment',' For his subsequent suicidal act is a conclusive proof that his mind was unsettled from the outset, and so the divorce is valid as in the case of a person dangerously ill; v. p. 212, n. 4.');">¹¹</span>

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