How do you locate a dead sim?
The dead sim is Santos Altman.
Forum Discussion
If you want to summon the ghost but not add the ghost to your household, there is a way to do this with Realm of Magic if you have that pack. Put a spellcaster sim in your household and either with cheats or through playing get them to know the Necrocall spell. Your spellcaster sim can then cast this spell on the grave to summon the ghost associated with that grave but not put the ghost in the household. Morgyn Ember knows this spell, but if you put them in your household you won't be able to make them the Sage of the Untamed again without mods because the game will choose a new sage, so only use Morgyn if you don't care who the sages are in the Magic Realm.
You still need to find the urn or gravestone, even if you use Necrocall. It looks like your dead Sim changed his name from Travis Scott to Santos Altman, but the same advice applies. Go to the house he lived in, if you know where it is, and that's probably where you'll find his grave. If you don't know where he lived, or his grave isn't there, your best bet is probably to check every lot in every world, starting with the residential lots.
ETA: Or follow the advice from CGrant56, to try to find the ghost without locating the grave.
