The phrase "dying unexpectedly" can be replaced with various synonyms that convey a sense of suddenness or surprise. For example, one could say "passing away abruptly," "suddenly departing," "perishing without warning," or "leaving this world unexpectedly." The word "unexpectedly" could also be replaced with terms such as "inexplicably," "abruptly," "swiftly," or "unforeseen," to further emphasize the unexpectedness of the event. Regardless of which synonym is used, the phrase connotes a sense of shock and sadness at the sudden loss of someone. When discussing a sensitive topic like this, it's important to choose language that is respectful and appropriate.