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If, for example, I plan a character to die in the middle of the story, and let's say I'd like to foreshadow his death by dropping a few hints here and there, what should I avoid when dropping hints about the nearing death?

If, for example, I plan for a character to die in the middle of the story, and let's say I'd like to foreshadow his death by dropping a few hints here and there, what should I avoid when dropping hints about the approaching death?