Burning: Fire spreads into the square where the Sim is standing. Results in a red ghost.
Disease: If a fatal disease is not treated for ten days the Sim will die. Results in a green ghost.
Drowning: Energy Need hits -100 (all red) while swimming. Results in a blue ghost that leaves puddles around the house when it appears.
Electrocution: Three or more Needs hit -90 (red) while a Sim repairs an electrical object with a low Mechanical Skill. Results in a yellow ghost.
Flies: In a very messy room, when a Sim steps over a plate all flies may form a deadly killer swarm. Results in a purple ghost.
Old Age: When a Sim reaches the end of his life. Results in a white ghost.
Satellite: When a satellite falls on a Sim while Stargazing (without a telescope) or Watch Cloud. Results in an orange ghost. Note: You can sell the Satellite in buy mode.
Scared: When three needs drop below -90 because of a ghost scare. Results in a pink ghost.
Starvation: Hunger reaches -100. Kids and younger cannot starve. Results in a transparent ghost that will take food out of the refrigerator.
Note: Babies and toddlers are fire-proof and cannot die by any cause; the Social Worker will instead take them away. Children can die of fire, drowning or disease. Rather than starving to death, children in hunger failure will be taken away by the Social Worker.