I think you can use testingcheatsenabled true, shift click on the sim, click delete. I take it, he is an NPC sim. I know I can use it on my own sims, but I have never tried it on NPC, just a thought. Or find "resetsim fullname of sim" enter. I also used this one on a sim downtown, that had been in the same spot for days. I used that and, poof, she was gone.