Not sure if these have been brought up before, but I found a list of the 10 ways our sims can die over on SimsVIP You can read the full details
hereThe ways are Electrocution, Hunger, Fire, Rocket Ship Crash Landing, Old Age, Overexertion, Cowplant, Embarrassment, Anger, and Hysteria.
I found out about the overexertion the other day. My sim was a bit of a lady killer (literally) and was wooing an elder friend. He invited her to stay the night and proposed to her. They celebrated with a wild night, but unfortunately, it was too much for her and Grim came for her. My sim was heartbroken and cried for days.. he even watered his plants with his tears!