Date: 29 Kislev 5596
From: Rabbi Moshe Sofer
To: Rabbi Menachem Aryeh
A man married a woman who had three previous husbands; he was told she was divorced from the first and the other two died, but it was later discovered her first husband also died while married to her, raising the question of her status as a 'killer wife' and her right to a ketubah.
Source: Shu"t Chasam Sofer Collected §70