不知所终

Explanation: Final: Finally, the ending. Do not know the outcome or whereabouts. 　　Usage: Verb-object type; for the predicate; said they did not know the ending or fate 　　Source: Song Mai, "A Chi Cuizu Wu Yi Jian": "go after the village, I do not know its end." 　　Examples: I baby in Hukou, a monk who was holding the book, weeks after the line of the county ... ... ~. (Mining Heng Son "recorded insects Man")