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A "Dear John letter" is a letter written to a husband or boyfriend by his wife or girlfriend to inform him their relationship is over, usually because the author has found another lover. Dear John Letters are often written out of an inability or unwillingness to inform the person face to face. The reverse situation, in which someone writes to his wife or girlfriend to break off the relationship, is referred to as a "Dear Jane letter."
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The phrase "that's all she wrote" is believed to have originated from Dear John letters. These letters would contain either the words "Dear John" and abruptly terminate, or only contain the words "Dear John, goodbye." The phrase "that's all she wrote" is used to indicate the end of story or an abrupt end of story, especially when the reader has a desire to know more, but the writer does not want to fulfill that desire. An example of this connection can be found in the 1951 country hit "Dear John" by Hank Williams. In this song, the chorus proceeds as "...And that's all she wrote, Dear John...", сообщает нам Вики.