Look at the Nadir (4th house cusp) in the horoscope chart. What sign is there, what are the rulers and what are the transits to your 4th house and their rulers. Pluto on Nadir, very indicative (Libra ascendants have it these days) of possible endings. Look also at the 12th house, rulers, natal aspects and transits. Sagittarius rising have it these days. Are you talking about natural death? Posting the chart and asking more specific question always helps with the answer. Good luck!