If it is a mod that uses scripts, make sure Scripts Mods are enabled in your game settings. Whatever is still on Mod The Sims is outdated.
You can download any from given mods below. Some cool Sims 4 murder mod is given here with proper information about them. Because sim 4 gives a realistic experience to the player and this thing should not affect the player’s mind. You can download them if you don’t take gaming that much seriously.
Sim 4 murder mod is a very mature type of mod.
