Talk to the grim reaper about grilled cheese - where do I find him?

Once you run into him once, he seems to lurk in a lot of places -- one of my Sims met him, then I was at the museum with another Sim and he was there painting a picture (hmmm, wonder if the Klepto trait will allow Sims to steal the paintings done by other Sims and left on the easel?). Try and find a place where a lot of Elders hang out -- sooner or later someone's going to die and he'll show up.