A succulent that is dying of overwatering (the most common cause of mortality in these plants) begins to look “rusty,” with reddish, yellowish, and brownish-tinged leaves. The leaves will develop what look like wrinkles, and stems will become easy to snap. Succulents that are dying from a lack of light will have a long, leggy stem with widely spaced out leaves, and the leaves will take on more of a bluish color.