HERE IS EXACTLY HOW I DID IT ・
One sim, low cooking skill. ・
4 cats, all adults. ・
Kill sim by fire. ・
Before sim is turned into urn, put the grim reaper in your household with cheats. ・
Remove grim reaper from household once the sim is turned into an urn. ・
Now you have no sims in your household. It will not give you a death message. There are many funny glitches if you wait around for like 5 minutes, would recommend doing if you’re bored. ・