There's always Book of Chaos as well. You can kill a Sim in lots of ways with a simple inventory item. Electrocution, fire, Kiss of Death, drowning in pee, throwing a poison drink in their face, and others. There are also various torments like alien abduction, freezing (and you don't even need to own a Sim Ray), making them puke, etc. If anyone uses it though, two cautions. 1. Don't leave it in your bookshelf. Since the shelf can't recognize CC books, it will disable the "Read..." option because it interferes with the list. 2. The afflicted Sim may not stay dead. If this happens, Shift+Click the Urn/Tombstone, add the ghost to your household and either delete or rekill them. It's a fun mod, in spite of its shortcomings.